GroupsWithPropertyT/SL_orbit.jl

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2017-06-08 20:09:36 +02:00
include("Orb_AutFN.jl")
###############################################################################
#
# Action of WreathProductElems on Nemo.MatElem
#
###############################################################################
function matrix_emb(MM::Nemo.MatSpace, g::WreathProducts.WreathProductElem)
parent(g).P.n == MM.cols == MM.rows || throw("No natural embedding of $(parent(g)) in ")
powers = [(elt == parent(elt)() ? 0: 1) for elt in g.n.elts]
elt = diagm([(-1)^(elt == parent(elt)() ? 0: 1) for elt in g.n.elts])
return MM(elt)*MM(Nemo.matrix_repr(g.p)')
end
function (g::WreathProducts.WreathProductElem)(A::Nemo.MatElem)
G = matrix_emb(parent(A), g)
inv_G = matrix_emb(parent(A), inv(g))
return G*A*inv_G
end
###############################################################################
#
# Generating set
#
###############################################################################
function E(i::Int, j::Int, M::Nemo.MatSpace)
@assert i≠j
m = one(M)
m[i,j] = m[1,1]
return m
end
function SLsize(n,p)
result = BigInt(1)
for k in 0:n-1
result *= p^n - p^k
end
return div(result, p-1)
end
function SL_generatingset(n::Int)
indexing = [(i,j) for i in 1:n for j in 1:n if i≠j]
G = Nemo.MatrixSpace(Nemo.ZZ, n, n)
S = [E(i,j,G) for (i,j) in indexing];
S = vcat(S, [transpose(x) for x in S]);
return G, unique(S)
end
function SL_generatingset(n::Int, p::Int)
p == 0 && return SL_generatingset(n)
(p > 1 && n > 1) || throw("Both n and p should be positive integers!")
@info("Size(SL($n,$p)) = $(SLsize(n,p))")
F = Nemo.ResidueRing(Nemo.ZZ, p)
G = Nemo.MatrixSpace(F, n, n)
indexing = [(i,j) for i in 1:n for j in 1:n if i≠j]
S = [E(i, j, G) for (i,j) in indexing]
S = vcat(S, [transpose(x) for x in S])
return G, unique(S)
end
###############################################################################
#
# Parsing command line
#
###############################################################################
function parse_commandline()
settings = ArgParseSettings()
@add_arg_table settings begin
"--tol"
help = "set numerical tolerance for the SDP solver (default: 1e-5)"
arg_type = Float64
default = 1e-5
"--iterations"
help = "set maximal number of iterations for the SDP solver (default: 20000)"
arg_type = Int
default = 20000
"--upper-bound"
help = "Set an upper bound for the spectral gap (default: Inf)"
arg_type = Float64
default = Inf
"--cpus"
help = "Set number of cpus used by solver (default: auto)"
arg_type = Int
required = false
"-N"
help = "Consider automorphisms of free group on N generators (default: N=2)"
arg_type = Int
default = 2
"-p"
help = "Matrices over filed of p-elements (default: p=0 => over ZZ)"
arg_type = Int
default = 0
"--radius"
help = "Find the decomposition over B_r(e,S)"
arg_type = Int
default = 2
end
return parse_args(settings)
end
###############################################################################
#
# main
#
###############################################################################
function main()
parsed_args = parse_commandline()
N = parsed_args["N"]
p = parsed_args["p"]
if p == 0
dirname = "SL$(N)Z"
else
dirname = "SL$(N)_$p"
end
radius = parsed_args["radius"]
dirname = "$(dirname)_r=$radius"
isdir(dirname) || mkdir(dirname)
logger = PropertyT.setup_logging(dirname)
G, S = SL_generatingset(N, p)
info(logger, G)
info(logger, "Symmetric generating set of size $(length(S))")
info(logger, S)
AutS = WreathProduct(Nemo.FiniteField(2,1, "a")[1], PermutationGroup(N))
tol = parsed_args["tol"]
iterations = parsed_args["iterations"]
upper_bound = parsed_args["upper-bound"]
solver = SCS.SCSSolver(eps=tol, max_iters=iterations, verbose=true, linearsolver=SCS.Indirect)
orbit_check_propertyT(logger, dirname, G, S, AutS, solver, upper_bound)
end
main()