Verification of periodicity criterion works for nonthin knots.
This commit is contained in:
Wojciech Politarczyk
parent
b153876f41
commit
f80ac2ce8e
6
kk.cpp
6
kk.cpp
@ -346,7 +346,7 @@ void check_periodicity(std::string out_file) {
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// ten crossings
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int num_cr = 10;
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int knot_index = stoi(k.substr(3));
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for(int i = knot_index; i < rolfsen_crossing_knots(num_cr); i++) {
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for(unsigned i = knot_index; i < rolfsen_crossing_knots(num_cr); i++) {
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std::string knot_name = std::to_string(num_cr) + "_" + std::to_string(i);
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knot_diagram kd_temp = parse_knot(knot_name.c_str());
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kd.marked_edge = 1;
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@ -362,7 +362,7 @@ void check_periodicity(std::string out_file) {
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int knot_index = stoi(k.substr(3));
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char alt = k[2];
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bool alternating = (alt == 'a' ? true : false);
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for(int i = knot_index; i <= htw_knots(num_cr, alternating); i++) {
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for(unsigned i = knot_index; i <= htw_knots(num_cr, alternating); i++) {
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std::string knot_name = std::to_string(num_cr) + alt + std::to_string(i);
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knot_diagram kd_temp = parse_knot(knot_name.c_str());
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kd.marked_edge = 1;
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@ -378,7 +378,7 @@ void check_periodicity(std::string out_file) {
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// at most nine crossings
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int num_cr = stoi(k.substr(0, 1));
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int knot_index = stoi(k.substr(2));
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for(int i = knot_index; i <= rolfsen_crossing_knots(num_cr); i++) {
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for(unsigned i = knot_index; i <= rolfsen_crossing_knots(num_cr); i++) {
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std::string knot_name = std::to_string(num_cr) + "_" + std::to_string(i);
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knot_diagram kd_temp = parse_knot(knot_name.c_str());
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kd.marked_edge = 1;
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354
periodicity.cpp
354
periodicity.cpp
@ -1,5 +1,10 @@
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#include <periodicity.h>
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#include <simplify_chain_complex.h>
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#include <algorithm>
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using polynomial_tuple = std::vector<std::tuple<multivariate_laurentpoly<Z>, multivariate_laurentpoly<Z>, multivariate_laurentpoly<Z>>>;
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using bounds_vector = std::map<multivariate_laurentpoly<Z>, std::pair<Z, Z>>;
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bool Przytycki_periodicity_checker::check(int period) const {
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switch(period) {
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@ -38,8 +43,46 @@ std::string Przytycki_periodicity_checker::operator () (int period) const {
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return res.str();
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}
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void Kh_periodicity_checker::compute_knot_polynomials(knot_diagram& kd) {
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bool Kh_bounds_iterator::advance() {
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if(level == bv.end())
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return false;
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for(auto bv_it = bv.begin(); bv_it != level; ++bv_it) {
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if(current_state[bv_it->first] < (bv_it->second).second) {
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current_state[bv_it->first] += period;
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for(auto bv_it_2 = bv.begin(); bv_it_2 != bv_it; ++bv_it_2) {
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current_state[bv_it_2->first] = bv_it_2->second.first;
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}
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return true;
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}
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}
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if(current_state[level->first] < bv[level->first].second) {
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current_state[level->first] += period;
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for(auto bv_it = bv.begin(); bv_it != level; ++bv_it) {
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current_state[bv_it->first] = bv_it->second.first;
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}
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return true;
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}
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++level;
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if(level == bv.end())
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return false;
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current_state[level->first] += period;
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for(auto bv_it = bv.begin(); bv_it != level; ++bv_it) {
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current_state[bv_it->first] = bv_it->second.first;
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}
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return true;
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}
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multivariate_laurentpoly<Z> Kh_bounds_iterator::get_polynomial() const {
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polynomial p;
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for(auto& cs : current_state) {
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p += cs.second * cs.first;
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}
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return p;
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}
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std::vector<multivariate_laurentpoly<Z>>
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Kh_periodicity_checker::compute_knot_polynomials(knot_diagram& kd) {
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unsigned m = kd.num_components ();
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if (m != 1) {
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std::cerr << "warning: this implementation of the criterion works for knots only...";
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@ -56,187 +99,201 @@ void Kh_periodicity_checker::compute_knot_polynomials(knot_diagram& kd) {
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// computing Khovanov homology
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if(verbose)
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std::cout << "Computing Khovanov homology" << std::endl;
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{
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chain_complex_simplifier<Z2> s (C, d, maybe<int>(1), maybe<int>(0));
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std::cerr << "Computing Khovanov homology" << std::endl;
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std::vector<polynomial> lee_ss_polynomials;
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int k = 0;
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for(;;) {
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chain_complex_simplifier<Z2> s(C, d, maybe<int>(1), maybe<int>(2*k));
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C = s.new_C;
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d = s.new_d;
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khp = C->free_poincare_polynomial();
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if(verbose)
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std::cout << "KhP = " << khp << "\n";
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lee_ss_polynomials.push_back(C->free_poincare_polynomial());
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if(k != 0)
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mul.push_back(polynomial(Z(1)) + polynomial(Z(1), VARIABLE, 1, 1) * polynomial(Z(1), VARIABLE, 2, 2 * k));
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if(d == 0)
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break;
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k++;
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}
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// computing Lee homolgy
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if(verbose)
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std::cout << "Computing Lee homology" << std::endl;
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{
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chain_complex_simplifier<Z2> s(C, d, maybe<int>(1), maybe<int>(2));
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C = s.new_C;
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d = s.new_d;
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leep = C->free_poincare_polynomial();
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if(d != 0) {
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std::cout << "For now, you can only use this criterion on Kh-thin knots." << std::endl;
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exit(EXIT_FAILURE);
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}
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if(verbose) {
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std::cout << "LeeP = " << leep << "\n";
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}
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khp = *lee_ss_polynomials.begin();
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leep = *lee_ss_polynomials.rbegin();
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if(verbose) {
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std::cerr << "KhP = " << khp << "\n";
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std::cerr << "LeeP = " << leep << "\n";
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}
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// for(unsigned i = 0; i < lee_ss_polynomials.size(); ++i) {
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// std::cerr << "lee_ss_polynomials[" << i << "]= "
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// << lee_ss_polynomials[i] << "\n";
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// std::cerr << "mul[" << i << "] = " << mul[i] << "\n";
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// }
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return lee_ss_polynomials;
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}
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void Kh_periodicity_checker::compute_quot() {
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polynomial diff = khp - leep;
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while(diff != 0) {
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pair<monomial, Z> m = diff.head();
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if(m.first.m[1] == 1) {
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pair<monomial, Z> m1 = diff.tail();
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while(m1.first.m.card() == 1 && m1.first.m[2]) {
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quot += polynomial(m1.second, m1.first);
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polynomial p = polynomial(m1.second, m1.first) * mul;
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diff -= p;
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if(diff != 0)
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m1 = diff.tail();
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else break;
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void Kh_periodicity_checker::compute_quot(const std::vector<polynomial>& lee_ss_polynomials) {
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// quot.push_back(polynomial(Z(0)));
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for(unsigned i = 1; i < lee_ss_polynomials.size(); ++i) {
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polynomial diff = lee_ss_polynomials[i-1] - lee_ss_polynomials[i];
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polynomial q = 0;
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// std::cerr << "diff = " << diff << "\n";
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// std::cerr << "mul = " << mul[i-1] << "\n";
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while(diff != 0) {
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pair<monomial, Z> m = diff.head();
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if(m.first.m[1] == 1) {
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pair<monomial, Z> m1 = diff.tail();
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while(m1.first.m.card() == 1 && m1.first.m[2]) {
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q += polynomial(m1.second, m1.first);
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polynomial p = polynomial(m1.second, m1.first) * mul[i-1];
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diff -= p;
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if(diff != 0)
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m1 = diff.tail();
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else break;
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}
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if(diff != 0)
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m = diff.head();
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else
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break;
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}
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if(diff != 0)
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m = diff.head();
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else
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break;
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q += polynomial(m.second, m.first);
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polynomial p = polynomial(m.second, m.first) * mul[i-1];
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diff -= p;
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}
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quot += polynomial(m.second, m.first);
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polynomial p = polynomial(m.second, m.first) * mul;
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diff -= p;
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quot.push_back(q);
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}
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// for(unsigned i = 0; i < quot.size(); ++i) {
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// std::cerr << "quot[" << i << "] = " << quot[i] << "\n";
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// }
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}
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std::pair<multivariate_laurentpoly<Z>, multivariate_laurentpoly<Z>>
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Kh_periodicity_checker::compute_quotient_and_remainder(const polynomial& quot,
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int period) const {
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polynomial quotient, remainder;
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for(map<monomial, Z>::const_iter i = quot.coeffs; i; i++) {
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std::tuple<Z,Z> div = i.val().divide_with_remainder(period - 1);
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quotient += polynomial(std::get<0>(div), i.key());
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remainder += polynomial(std::get<1>(div), i.key());
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polynomial_tuple
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Kh_periodicity_checker::compute_quotient_and_remainder(const std::vector<polynomial>& quot, int period) const {
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polynomial_tuple decomposed_khp;
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for(unsigned i = 0; i < quot.size(); ++i) {
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polynomial quotient, remainder;
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for(map<monomial, Z>::const_iter j = quot[i].coeffs; j; j++) {
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std::tuple<Z,Z> div = j.val().divide_with_remainder(period - 1);
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quotient += polynomial(std::get<0>(div), j.key());
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remainder += polynomial(std::get<1>(div), j.key());
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}
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decomposed_khp.push_back(std::make_tuple(quotient, remainder, std::move(mul[i])));
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}
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if(verbose) {
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std::cout << "Decomposition of Khp = " << std::endl
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<< leep << " + ("
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<< mul << ") * ("
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<< remainder;
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if(quotient != 0) {
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std::cout << " + " << (period - 1)
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<< " * (" << quotient
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<< ")";
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std::cerr << "Decomposition of Khp = " << std::endl
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<< leep;
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for(auto& p: decomposed_khp) {
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polynomial quotient, remainder, mul;
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tie(quotient, remainder, mul) = p;
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std::cerr << " + (" << mul << ") * ("
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<< remainder;
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if(quotient != 0)
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std::cerr << " + " << (period - 1)
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<< "*(" << quotient << ")";
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std::cerr << ")";
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}
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std::cout << ")" << std::endl;
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std::cerr << "\n";
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}
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return std::make_pair(quotient, remainder);
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return decomposed_khp;
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}
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std::map<multivariate_laurentpoly<Z>, std::pair<Z,Z>>
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Kh_periodicity_checker::compute_bounds(const polynomial& p, int period) const {
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std::map<polynomial, std::pair<Z, Z>> bounds;
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bounds_vector
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Kh_periodicity_checker::compute_bounds(const polynomial_tuple& p_tuple, int period) const {
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periodic_congruence_checker<Z> pcc(period);
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for(map<monomial, Z>::const_iter i = p.coeffs; i; ++i) {
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monomial mon;
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int exp = 0;
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if(i.key().m % ev_index) {
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exp = i.key().m[ev_index];
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for(map<unsigned, int>::const_iter j = i.key().m; j; ++j) {
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if(j.key() != ev_index) {
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bounds_vector bounds_v;
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for(auto& p: p_tuple) {
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polynomial quotient, remainder, mul;
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tie(quotient, remainder, mul) = p;
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for(map<monomial, Z>::const_iter i = quotient.coeffs; i; ++i) {
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monomial mon;
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int exp = 0;
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if(i.key().m % ev_index) {
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exp = i.key().m[ev_index];
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for(map<unsigned, int>::const_iter j = i.key().m; j; ++j) {
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if(j.key() != ev_index) {
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int v = j.val() % (2 * period);
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if(v < 0) v += (2 * period);
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mon *= monomial(VARIABLE, j.key(), v);
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}
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}
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}
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else {
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for(map<unsigned, int>::const_iter j = i.key().m; j; ++j) {
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int v = j.val() % (2 * period);
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if(v < 0) v += (2 * period);
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mon *= monomial(VARIABLE, j.key(), v);
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}
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}
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}
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else {
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for(map<unsigned, int>::const_iter j = i.key().m; j; ++j) {
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int v = j.val() % (2 + period);
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if (v < 0) v += (2 * period);
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mon *= monomial(VARIABLE, j.key(), v);
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// std::cerr << polynomial(i.val() * pow(-1,exp), mon) << "\n";
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Z v_temp = i.val() * pow(-1, exp);
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polynomial p_temp = (polynomial(1, mon) * mul).evaluate(-1, ev_index);
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p_temp = pcc.reduce(p_temp - invert_variable(p_temp, index));
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// std::cerr << "p_temp = " << p_temp << "\n";
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// std::cerr << "v_temp = " << v_temp << "\n";
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// std::cerr << "min_exp = " << min_exp << "\n";
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if(bounds_v.count(p_temp)) {
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if(v_temp >= 0)
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bounds_v[p_temp].second += (v_temp * period);
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else
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bounds_v[p_temp].first += (v_temp * period);
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}
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else if(bounds_v.count(p_temp)) {
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if(v_temp >= 0)
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bounds_v[p_temp].first -= (v_temp * period);
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else
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bounds_v[p_temp].second -= (v_temp * period);
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}
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else {
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bounds_v.emplace(p_temp,
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std::make_pair<Z,Z>((v_temp < 0 ? (v_temp * period) : Z(0)), (v_temp >= 0 ? (v_temp * period) : Z(0))));
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}
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}
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// std::cout << polynomial(i.val() * pow(-1, exp), mon) << "\n";
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Z v_temp = i.val() * pow(-1, exp);
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polynomial p_temp = (polynomial(1, mon) * mul).evaluate(-1, ev_index);
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p_temp = pcc.reduce(p_temp - invert_variable(p_temp, index));
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if(v_temp >= 0)
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bounds[p_temp].second += (v_temp * period);
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else
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bounds[p_temp].first += (v_temp * period);
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}
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// for(std::map<polynomial, std::pair<Z,Z>>::iterator mi = bounds.begin(); mi != bounds.end(); ++mi) {
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// std::cout << "Monomial: " << mi->first << "\n";
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// std::cout << "Max: " << std::get<1>(mi->second)
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// << ", Min: " << std::get<0>(mi->second) << "\n";
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// }
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return bounds;
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}
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std::vector<multivariate_laurentpoly<Z>>
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Kh_periodicity_checker::compute_basis_polynomials(int period) const {
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std::vector<polynomial> res;
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periodic_congruence_checker<Z> pcc(period);
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for(int i = 1; i < period; i += 2) {
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res.push_back(pcc.reduce(get_basis_polynomial(i)));
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if(verbose) {
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for(auto& t: bounds_v) {
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Z neg, pos;
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tie(neg, pos) = t.second;
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std::cerr << "polynomial = " << t.first << "\n";
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std::cerr << "min = " << neg << ", max = " << pos << "\n";
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}
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}
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return res;
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return bounds_v;
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}
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multivariate_laurentpoly<Z> Kh_periodicity_checker::get_basis_polynomial(monomial mon) const {
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return (polynomial(Z(1), mon) * mul).evaluate(-1, ev_index) -
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invert_variable((polynomial(Z(1), mon) * mul).evaluate(-1, ev_index), index);
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}
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bool Kh_periodicity_checker::check(const polynomial& q,
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const polynomial& r,
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Test_Result Kh_periodicity_checker::check(const polynomial_tuple& polynomials,
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int period) const {
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periodic_congruence_checker<Z> pcc(period);
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polynomial t = (leep + mul * (r - q)).evaluate(-1, ev_index);
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t = pcc.reduce(t - invert_variable(t, index));
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if(pcc(t)) {
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return true;
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polynomial t = polynomial(COPY, leep);
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for(auto& p : polynomials) {
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polynomial quotient, remainder, mul;
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tie(quotient, remainder, mul) = p;
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t += mul * (remainder - quotient);
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//std::cerr << "t = " << t << "\n";
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}
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else if(q == 0)
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return false;
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// std::cout << t << std::endl;
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// std::cout << q << "\n";
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std::map<polynomial, std::pair<Z,Z>> bounds = compute_bounds(q, period);
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for(std::map<polynomial, std::pair<Z,Z>>::iterator it = bounds.begin();
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it != bounds.end(); ++it) {
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polynomial mon = it->first;
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polynomial s = t.evaluate(-1, ev_index);
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s = pcc.reduce(s - invert_variable(s, index));
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if(pcc(s)) {
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return Test_Result::MAYBE;
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}
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std::vector<polynomial> basis_polynomials = compute_basis_polynomials(period);
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polynomial p = pcc.reduce(get_basis_polynomial(2 * period - 1));
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for(Z i = bounds[p].first; i <= bounds[p].second; i += 5) {
|
||||
polynomial p_temp = t + polynomial(i, VARIABLE, index, 0) * p;
|
||||
// std::cout << "i = " << i << "\n";
|
||||
// std::cout << "p_temp = " << p_temp << "\n";
|
||||
if(p_temp == 0)
|
||||
return true;
|
||||
for(std::vector<polynomial>::iterator it = basis_polynomials.begin(); it != basis_polynomials.end(); ++it) {
|
||||
pair<monomial, Z> m = p_temp.coeffs.head();
|
||||
monomial mon = m.first;
|
||||
Z c = m.second;
|
||||
polynomial pp = pcc.reduce(get_basis_polynomial(mon));
|
||||
if(pp == *it) {
|
||||
if(c < bounds[pp].first || c > bounds[pp].second)
|
||||
break;
|
||||
else {
|
||||
// std::cout << "pp = " << pp << "\n";
|
||||
p_temp -= polynomial(c, VARIABLE, index, 0) * pp;
|
||||
// std::cout << "p_temp = " << p_temp << "\n";
|
||||
if(p_temp == 0)
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
else if(all_of(polynomials.begin(), polynomials.end(),
|
||||
[](std::tuple<polynomial, polynomial, polynomial> t)
|
||||
{ return get<0>(t) == 0; }))
|
||||
return Test_Result::NO;
|
||||
bounds_vector bounds = compute_bounds(polynomials, period);
|
||||
|
||||
if(verbose)
|
||||
std::cerr << "s = " << s << "\n";
|
||||
Kh_bounds_iterator Kh_b_it(bounds, period);
|
||||
if(verbose)
|
||||
std::cerr << "current_state = " << Kh_b_it.get_polynomial() << "\n";
|
||||
if(Kh_b_it.get_polynomial() == s)
|
||||
return Test_Result::MAYBE;
|
||||
while(Kh_b_it.advance()) {
|
||||
if(verbose)
|
||||
std::cerr << "current_state = " << Kh_b_it.get_polynomial() << "\n";
|
||||
if(s == Kh_b_it.get_polynomial())
|
||||
return Test_Result::MAYBE;
|
||||
}
|
||||
|
||||
return false;
|
||||
return Test_Result::NO_NONTRIVIAL_DECOMP;
|
||||
}
|
||||
|
||||
std::string Kh_periodicity_checker::operator () (int period) const {
|
||||
@ -247,10 +304,11 @@ std::string Kh_periodicity_checker::operator () (int period) const {
|
||||
out << knot_name << ": period = " << period << ": No (Przytycki's criterion).";
|
||||
}
|
||||
else {
|
||||
std::pair<polynomial, polynomial> q_r = compute_quotient_and_remainder(quot, period);
|
||||
bool res = check(std::get<0>(q_r), std::get<1>(q_r), period);
|
||||
auto q_r = compute_quotient_and_remainder(quot, period);
|
||||
Test_Result res = check(q_r, period);
|
||||
out << knot_name << ": period = " << period << ": "
|
||||
<< (res ? "Maybe" : "No");
|
||||
<< (res == Test_Result::MAYBE ? "Maybe" :
|
||||
(res == Test_Result::NO ? "No" : "No (Nontrivial decomposition)."));
|
||||
}
|
||||
return out.str();
|
||||
}
|
||||
|
||||
@ -6,6 +6,7 @@
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include <utility>
|
||||
#include <tuple>
|
||||
|
||||
extern bool verbose;
|
||||
extern const char* knot;
|
||||
@ -14,6 +15,8 @@ extern std::string periodicity_test;
|
||||
|
||||
const std::vector<int> primes_list = {5, 7, 11, 13, 17, 19};
|
||||
|
||||
enum class Test_Result { MAYBE, NO, NO_NONTRIVIAL_DECOMP };
|
||||
|
||||
const unsigned eval_index = 1;
|
||||
const unsigned invert_index = 2;
|
||||
|
||||
@ -59,6 +62,8 @@ periodic_congruence_checker<T>::reduce(const multivariate_laurentpoly<T>& pol) c
|
||||
monomial mon = monomial(VARIABLE, index, c);
|
||||
res += polynomial(i.val(), mon);
|
||||
}
|
||||
// if(verbose)
|
||||
// std::cout << "res = " << res << "\n";
|
||||
return res;
|
||||
}
|
||||
|
||||
@ -78,43 +83,61 @@ class Przytycki_periodicity_checker {
|
||||
std::string operator() (int period) const;
|
||||
};
|
||||
|
||||
class Kh_bounds_iterator {
|
||||
using polynomial = multivariate_laurentpoly<Z>;
|
||||
using monomial = multivariate_laurent_monomial;
|
||||
using polynomial_tuple = std::vector<std::tuple<polynomial, polynomial, polynomial>>;
|
||||
using bounds_vector = std::map<multivariate_laurentpoly<Z>, std::pair<Z, Z>>;
|
||||
|
||||
bounds_vector bv;
|
||||
int period;
|
||||
std::map<polynomial, Z> current_state;
|
||||
std::map<polynomial, std::pair<Z,Z>>::iterator level;
|
||||
|
||||
public:
|
||||
Kh_bounds_iterator(bounds_vector v, int p) :
|
||||
bv(v), period(p) {
|
||||
for(auto& v: bv) {
|
||||
current_state[v.first] = v.second.first;
|
||||
}
|
||||
level = bv.begin();
|
||||
}
|
||||
~Kh_bounds_iterator() {}
|
||||
|
||||
bool advance();
|
||||
polynomial get_polynomial() const;
|
||||
};
|
||||
|
||||
class Kh_periodicity_checker {
|
||||
using polynomial = multivariate_laurentpoly<Z>;
|
||||
using monomial = multivariate_laurent_monomial;
|
||||
using polynomial_tuple = std::vector<std::tuple<polynomial, polynomial, polynomial>>;
|
||||
using bounds_vector = std::map<multivariate_laurentpoly<Z>, std::pair<Z, Z>>;
|
||||
|
||||
unsigned ev_index;
|
||||
unsigned index;
|
||||
|
||||
polynomial khp, leep, quot;
|
||||
polynomial mul;
|
||||
polynomial khp, leep;
|
||||
std::vector<polynomial> quot, mul, quotients, remainders;
|
||||
|
||||
std::string knot_name;
|
||||
|
||||
void compute_knot_polynomials(knot_diagram& kd);
|
||||
void compute_quot();
|
||||
std::pair<polynomial, polynomial> compute_quotient_and_remainder(const polynomial& p,
|
||||
int period) const;
|
||||
std::map<polynomial, std::pair<Z,Z>>
|
||||
compute_bounds(const polynomial& p, int period) const;
|
||||
polynomial get_basis_polynomial(int exp) const {
|
||||
return (polynomial(1, VARIABLE, index, exp) * mul).evaluate(-1, ev_index) -
|
||||
invert_variable((polynomial(1, VARIABLE, index, exp) * mul).evaluate(-1, ev_index), index);
|
||||
}
|
||||
polynomial get_basis_polynomial(monomial mon) const;
|
||||
std::vector<polynomial> compute_basis_polynomials(int period) const;
|
||||
bool check(const polynomial& q, const polynomial& r, int period) const;
|
||||
std::vector<polynomial> compute_knot_polynomials(knot_diagram& kd);
|
||||
void compute_quot(const std::vector<polynomial>& lee_ss_polynomials);
|
||||
polynomial_tuple
|
||||
compute_quotient_and_remainder(const std::vector<polynomial>& p, int period) const;
|
||||
bounds_vector
|
||||
compute_bounds(const polynomial_tuple& p, int period) const;
|
||||
Test_Result check(const polynomial_tuple& polynomials, int period) const;
|
||||
|
||||
public:
|
||||
Kh_periodicity_checker(knot_diagram& kd, std::string knot_n) :
|
||||
knot_name(knot_n) {
|
||||
ev_index = 1;
|
||||
index = 2;
|
||||
mul = polynomial(Z(1))
|
||||
+ polynomial(1, VARIABLE, ev_index) *
|
||||
polynomial(1, VARIABLE, index, 2);
|
||||
|
||||
compute_knot_polynomials(kd);
|
||||
compute_quot();
|
||||
quot = std::vector<polynomial>();
|
||||
mul = std::vector<polynomial>();
|
||||
compute_quot(compute_knot_polynomials(kd));
|
||||
}
|
||||
|
||||
~Kh_periodicity_checker() {}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user