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move and update old tests to usetests.jl

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kalmarek 2019-06-04 22:51:48 +02:00
parent 5b923dfe4c
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2 changed files with 369 additions and 318 deletions

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@ -5,326 +5,9 @@ using GroupRings
using SparseArrays using SparseArrays
@testset "GroupRings" begin include("usetests.jl")
@testset "Constructors: PermutationGroup" begin
G = PermutationGroup(3)
@test isa(GroupRing(G), AbstractAlgebra.Ring)
@test isa(GroupRing(G), GroupRing)
RG = GroupRing(G)
@test isdefined(RG, :basis) == true
@test length(RG.basis) == 6
@test isdefined(RG, :basis_dict) == true
@test isdefined(RG, :pm) == false
@test isa(GroupRing(PermutationGroup(6), rand(1:6, 6,6)), GroupRing)
RG = GroupRing(G, cachedmul=true)
@test isdefined(RG, :pm) == true
@test RG.pm == zeros(Int, (6,6))
@test isa(complete!(RG), GroupRing)
@test all(RG.pm .> 0)
@test RG.pm == GroupRings.initializepm!(GroupRing(G, cachedmul=false), fill=true).pm
@test RG.basis_dict == GroupRings.reverse_dict(collect(G))
@test isa(GroupRing(G, collect(G)), GroupRing)
S = collect(G)
pm = create_pm(S)
@test isa(GroupRing(G, S), GroupRing)
@test isa(GroupRing(G, S, pm), GroupRing)
A = GroupRing(G, S)
B = GroupRing(G, S, pm)
@test RG == A
@test RG == B
end
@testset "GroupRing constructors FreeGroup" begin
using Groups
F = FreeGroup(3)
S = gens(F)
append!(S, [inv(s) for s in S])
basis, sizes = Groups.generate_balls(S, F(), radius=4)
d = GroupRings.reverse_dict(basis)
@test_throws KeyError create_pm(basis)
pm = create_pm(basis, d, sizes[2])
@test isa(GroupRing(F, basis, pm), GroupRing)
@test isa(GroupRing(F, basis, d, pm), GroupRing)
A = GroupRing(F, basis, pm)
B = GroupRing(F, basis, d, pm)
@test A == B
RF = GroupRing(F, basis, d, create_pm(basis, d, check=false))
nz1 = count(!iszero, RF.pm)
@test nz1 > 1000
GroupRings.complete!(RF)
nz2 = count(!iszero, RF.pm)
@test nz2 > nz1
@test nz2 == 45469
g = B()
s = S[2]
g[s] = 1
@test g == B(s)
@test g[s^2] == 0
@test_throws KeyError g[s^10]
end
@testset "GroupRingElems constructors/basic manipulation" begin
G = PermutationGroup(3)
RG = GroupRing(G, cachedmul=true)
a = rand(6)
@test isa(GroupRingElem(a, RG), GroupRingElem)
@test isa(RG(a), GroupRingElem)
@test all(isa(RG(g), GroupRingElem) for g in G)
@test_throws String GroupRingElem([1,2,3], RG)
@test isa(RG(G([2,3,1])), GroupRingElem)
p = G([2,3,1])
a = RG(p)
@test length(a) == 1
@test isa(a.coeffs, SparseVector)
@test a.coeffs[5] == 1
@test a[5] == 1
@test a[p] == 1
@test string(a) == "(1,2,3)"
@test string(-a) == " - 1(1,2,3)"
@test RG([0,0,0,0,1,0]) == a
s = G([1,2,3])
@test a[s] == 0
a[s] = 2
@test a.coeffs[1] == 2
@test a[1] == 2
@test a[s] == 2
@test string(a) == "2() + (1,2,3)"
@test string(-a) == " - 2() - 1(1,2,3)"
@test length(a) == 2
end
@testset "Arithmetic" begin
G = PermutationGroup(3)
RG = GroupRing(G, cachedmul=true)
a = RG(ones(Int, order(G)))
@testset "scalar operators" begin
@test isa(-a, GroupRingElem)
@test (-a).coeffs == -(a.coeffs)
@test isa(2*a, GroupRingElem)
@test eltype(2*a) == typeof(2)
@test (2*a).coeffs == 2 .*(a.coeffs)
ww = "Scalar and coeffs are in different rings! Promoting result to Float64"
@test isa(2.0*a, GroupRingElem)
@test_logs (:warn, ww) eltype(2.0*a) == typeof(2.0)
@test_logs (:warn, ww) (2.0*a).coeffs == 2.0.*(a.coeffs)
@test_logs (:warn, ww) (a/2).coeffs == a.coeffs./2
b = a/2
@test isa(b, GroupRingElem)
@test eltype(b) == typeof(1/2)
@test (b/2).coeffs == 0.25*(a.coeffs)
@test isa(convert(Rational{Int}, a), GroupRingElem)
@test eltype(convert(Rational{Int}, a)) == Rational{Int}
@test convert(Rational{Int}, a).coeffs ==
convert(Vector{Rational{Int}}, a.coeffs)
b = convert(Rational{Int}, a)
@test isa(b//4, GroupRingElem)
@test eltype(b//4) == Rational{Int}
@test isa(b//big(4), RingElem)
@test eltype(b//(big(4)//1)) == Rational{BigInt}
@test isa(a//1, GroupRingElem)
@test eltype(a//1) == Rational{Int}
@test (1.0a)//1 == (1.0a)
end
@testset "Additive structure" begin
@test RG(ones(Int, order(G))) == sum(RG(g) for g in G)
a = RG(ones(Int, order(G)))
b = sum((-1)^parity(g)*RG(g) for g in G)
@test 1/2*(a+b).coeffs == [1.0, 0.0, 1.0, 0.0, 1.0, 0.0]
a = RG(1) + RG(perm"(2,3)") + RG(perm"(1,2,3)")
b = RG(1) - RG(perm"(1,2)(3)") - RG(perm"(1,2,3)")
@test a - b == RG(perm"(2,3)") + RG(perm"(1,2)(3)") + 2RG(perm"(1,2,3)")
@test 1//2*2a == a
@test a + 2a == (3//1)*a
@test 2a - (1//1)*a == a
end
@testset "Multiplicative structure" begin
for g in G, h in G
a = RG(g)
b = RG(h)
@test a*b == RG(g*h)
@test (a+b)*(a+b) == a*a + a*b + b*a + b*b
end
for g in G
@test star(RG(g)) == RG(inv(g))
@test (one(RG)-RG(g))*star(one(RG)-RG(g)) ==
2*one(RG) - RG(g) - RG(inv(g))
@test aug((one(RG)-RG(g))) == 0
end
a = RG(1) + RG(perm"(2,3)") + RG(perm"(1,2,3)")
b = RG(1) - RG(perm"(1,2)(3)") - RG(perm"(1,2,3)")
@test a*b == mul!(a,a,b)
@test aug(a) == 3
@test aug(b) == -1
@test aug(a)*aug(b) == aug(a*b) == aug(b*a)
z = sum((one(RG)-RG(g))*star(one(RG)-RG(g)) for g in G)
@test aug(z) == 0
@test supp(z) == parent(z).basis
@test supp(RG(1) + RG(perm"(2,3)")) == [G(), perm"(2,3)"]
@test supp(a) == [perm"(3)", perm"(2,3)", perm"(1,2,3)"]
end
@testset "HPC multiplicative operations" begin
G = PermutationGroup(5)
RG = GroupRing(G, cachedmul=true)
RG2 = GroupRing(G, cachedmul=false)
Z = RG()
W = RG()
for g in [rand(G) for _ in 1:30]
X = RG(g)
Y = -RG(inv(g))
for i in 1:10
X[rand(G)] += rand(1:3)
Y[rand(G)] -= rand(1:3)
end
@test X*Y ==
RG2(X)*RG2(Y) ==
GroupRings.mul!(Z, X, Y)
@test Z.coeffs == GroupRings.GRmul!(W.coeffs, X.coeffs, Y.coeffs, RG.pm) == W.coeffs
@test (2*X*Y).coeffs ==
GroupRings.fmac!(W.coeffs, X.coeffs, Y.coeffs, RG.pm) ==
GroupRings.mul!(2, X*Y).coeffs
end
end
end
@testset "SumOfSquares in group rings" begin
= star
G = FreeGroup(["g", "h", "k", "l"])
S = G.(G.gens)
S = [S; inv.(S)]
ID = G()
RADIUS=3
@time E_R, sizes = Groups.generate_balls(S, ID, radius=2*RADIUS);
@test sizes == [9, 65, 457, 3201, 22409, 156865]
E_rdict = GroupRings.reverse_dict(E_R)
pm = GroupRings.create_pm(E_R, E_rdict, sizes[RADIUS]; twisted=true);
RG = GroupRing(G, E_R, E_rdict, pm)
g = RG.basis[2]
h = RG.basis[3]
k = RG.basis[4]
l = RG.basis[5]
G = (1-RG(g))
@test G^2 == 2 - RG(g) - (RG(g))
G = (1-RG(g))
H = (1-RG(h))
K = (1-RG(k))
L = (1-RG(l))
GH = (1-RG(g*h))
KL = (1-RG(k*l))
X = (2 - (RG(g)) - RG(h))
Y = (2 - (RG(g*h)) - RG(k))
@test -(2 - RG(g*h) - (RG(g*h))) + 2G^2 + 2H^2 == X^2
@test (2 - RG(g*h) - (RG(g*h))) == GH^2
@test -(2 - RG(g*h*k) - (RG(g*h*k))) + 2GH^2 + 2K^2 == Y^2
@test -(2 - RG(g*h*k) - (RG(g*h*k))) +
2(GH^2 - 2G^2 - 2H^2) +
4G^2 + 4H^2 + 2K^2 ==
Y^2
@test GH^2 - 2G^2 - 2H^2 == - X^2
@test -(2 - RG(g*h*k) - (RG(g*h*k))) + 4G^2 + 4H^2 + 2K^2 == 2X^2 + Y^2
@test GH^2 == 2G^2 + 2H^2 - (2 - (RG(g)) - RG(h))^2
@test KL^2 == 2K^2 + 2L^2 - (2 - (RG(k)) - RG(l))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) + 2*GH^2 + 2*KL^2 ==
(2 - (RG(g*h)) - RG(k*l))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
2(2G^2 + 2H^2 - (2 - (RG(g)) - RG(h))^2) +
2(2K^2 + 2L^2 - (2 - (RG(k)) - RG(l))^2) ==
(2 - (RG(g*h)) - RG(k*l))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
2(2G^2 + 2H^2) +
2(2K^2 + 2L^2) ==
(2 - (RG(g*h)) - RG(k*l))^2 +
2(2 - (RG(g)) - RG(h))^2 +
2(2 - (RG(k)) - RG(l))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
2(2 - (RG(g*h*k)) - RG(g*h*k)) + 2L^2 ==
(2 - (RG(g*h*k)) - RG(l))^2
@test 2 - (RG(g*h*k)) - RG(g*h*k) ==
2GH^2 + 2K^2 - (2 - (RG(g*h)) - RG(k))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
2(2GH^2 + 2K^2 - (2 - (RG(g*h)) - RG(k))^2) + 2L^2 ==
(2 - (RG(g*h*k)) - RG(l))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
2(2GH^2 + 2K^2) + 2L^2 ==
(2 - (RG(g*h*k)) - RG(l))^2 +
2(2 - (RG(g*h)) - RG(k))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
8G^2 + 8H^2 + 4K^2 + 2L^2 ==
(2 - (RG(g*h*k)) - RG(l))^2 + 2(2 - (RG(g*h)) - RG(k))^2 + 4(2 - (RG(g)) - RG(h))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) +
2GH^2 + 2KL^2 == (2 - (RG(g*h)) - RG(k*l))^2
@test -(2 - (RG(g*h*k*l)) - RG(g*h*k*l)) + 2(2G^2 + 2H^2) + 2(2K^2 + 2L^2) ==
(2 - (RG(g*h)) - RG(k*l))^2 + 2(2 - (RG(k)) - RG(l))^2 + 2(2 - (RG(g)) - RG(h))^2
end
end end

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test/usetests.jl Normal file
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@ -0,0 +1,368 @@
using Test
using AbstractAlgebra
using GroupRings
using SparseArrays
@testset "Constructors: PermutationGroup" begin
G = PermutationGroup(3)
@test GroupRing(zz, G, collect(G)) isa AbstractAlgebra.NCRing
@test GroupRing(zz, G, collect(G)) isa GroupRing
RG = GroupRing(zz, G, collect(G))
@test isdefined(RG, :basis)
@test length(RG.basis) == 6
@test length(RG) == 6
@test isdefined(RG, :basis_dict)
@test isdefined(RG, :pm) == false
@test RG.basis_dict == GroupRings.reverse_dict(collect(G))
@test GroupRing(zz, PermutationGroup(6), rand(1:6, 6,6)) isa GroupRing
RG = GroupRing(zz, G, collect(G), halfradius_length=order(G))
@test isdefined(RG, :pm)
@test RG.pm == zeros(Int32, (6,6))
@test GroupRings.complete!(RG) isa GroupRing
@test all(RG.pm .> 0)
S = collect(G)
@test RG.pm == GroupRings.create_pm(S, GroupRings.reverse_dict(S))
pm = GroupRings.create_pm(S, GroupRings.reverse_dict(S))
@test GroupRing(zz, G, S) isa GroupRing
@test GroupRing(zz, G, S, pm) isa GroupRing
A = GroupRing(zz, G, S)
B = GroupRing(zz, G, S, pm)
C = GroupRing(zz, G, pm)
@test RG == A
@test RG == B
@test RG == C
A = GroupRing(qq, G, S)
B = GroupRing(qq, G, S, pm)
C = GroupRing(qq, G, pm)
@test RG == A
@test RG == B
@test RG == C
end
@testset "Constructors FreeGroup" begin
using Groups
F = FreeGroup(3)
S = gens(F)
append!(S, [inv(s) for s in S])
basis, sizes = Groups.generate_balls(S, F(), radius=4)
d = GroupRings.reverse_dict(basis)
@test_throws KeyError GroupRings.create_pm(basis, d)
pm = GroupRings.create_pm(basis, d, sizes[2], check=false)
@test findfirst(iszero, pm) == nothing
@test GroupRing(zz, F, pm) isa GroupRing
@test GroupRing(zz, F, basis, d, pm) isa GroupRing
A = GroupRing(zz, F, pm)
B = GroupRing(zz, F, basis, d, pm)
@test A == B
RF = GroupRing(zz, F, basis, d, GroupRings.create_pm(basis, d, check=false))
nz1 = count(!iszero, RF.pm)
@test nz1 > 1000
GroupRings.complete!(RF, sizes[2], check=false)
@test_throws KeyError GroupRings.check_pm(RF.pm, RF.basis)
err = try
GroupRings.check_pm(RF.pm, RF.basis)
catch err
err
end
err.key
@test err.key == RF[2]^5
@test findfirst(iszero, RF.pm[1:sizes[2], 1:sizes[2]]) == nothing
nz2 = count(!iszero, RF.pm)
@test nz2 > nz1
@test nz2 == 2420
g = B()
s = S[2]
g[s] = 1
@test g == B(s)
@test g[s^2] == 0
@test_throws KeyError g[s^10]
end
@testset "GroupRingElems constructors/basic manipulation" begin
G = PermutationGroup(3)
RG = GroupRing(zz, G, collect(G), halfradius_length=order(G))
a = rand(-10:10, 6)
@test isa(GroupRingElem(a, RG), GroupRingElem)
@test isa(RG(a), GroupRingElem)
@test all(isa(RG(g), GroupRingElem) for g in G)
@test_throws DomainError GroupRingElem([1,2,3], RG)
@test isa(RG(G([2,3,1])), GroupRingElem)
p = G([2,3,1])
a = RG(p)
@test length(a.coeffs) == 6
@test isa(a.coeffs, SparseVector)
@test supp(a) == [p]
@test a.coeffs[5] == 1
@test a[5] == 1
@test a[p] == 1
@test string(a) == "1(1,2,3)"
@test string(-a) == " - 1(1,2,3)"
@test RG([0,0,0,0,1,0]) == a
s = G([1,2,3])
@test a[s] == 0
a[s] = -2
@test a.coeffs[1] == -2
@test a[1] == -2
@test a[s] == -2
@test string(a) == " - 2() + 1(1,2,3)"
@test string(-a) == "2() - 1(1,2,3)"
@test length(supp(a)) == 2
@test supp(a) == [G(), G([2,3,1])]
end
@testset "Arithmetic" begin
G = PermutationGroup(3)
RG = GroupRing(zz, G, collect(G), halfradius_length=order(G))
a = RG(ones(Int, order(G)))
@testset "scalar operators" begin
@test -a isa GroupRingElem
@test (-a).coeffs == -(a.coeffs)
@test 2*a isa GroupRingElem
@test eltype(2*a) == typeof(2)
@test (2*a).coeffs == 2 .*(a.coeffs)
wt(c) = "Coefficient ring does not contain scalar $c.\nThe result has coefficients in $(parent(c)) of type $(elem_type(parent(c)))."
@test 2.0*a isa GroupRingElem
@test_logs (:warn, wt(2.0)) eltype(2.0*a) == typeof(2.0)
@test_logs (:warn, wt(2.0)) (2.0*a).coeffs == 2.0.*(a.coeffs)
@test_logs (:warn, wt(0.5)) (a/2).coeffs == a.coeffs./2
b = a/2
@test b isa GroupRingElem
@test eltype(b) == typeof(1/2)
@test (b/2).coeffs == 0.25*(a.coeffs)
@test parent(b) == parent(a)
@test base_ring(parent(b)) == AbstractAlgebra.RDF
@test change_base_ring(parent(a), qq) isa GroupRing
QG = change_base_ring(parent(a), qq)
@test QG(a) == change_base_ring(a, qq)
aq = change_base_ring(a, qq)
@test eltype(aq) == elem_type(qq)
@test aq.coeffs == convert(Vector{elem_type(qq)}, a.coeffs)
@test aq//4 isa GroupRingElem
@test eltype(aq//4) == elem_type(qq)
@test_logs (:warn, wt(big(1//4))) aq//big(4) isa GroupRingElem
@test_logs (:warn, wt(big(1//4))) eltype(b//(big(4)//1)) == Rational{BigInt}
@test_logs (:warn, wt(1//1)) a//1 isa GroupRingElem
@test_logs (:warn, wt(1//1)) eltype(a//1) == Rational{Int}
af = change_base_ring(a, AbstractAlgebra.RDF)
@test aq == af
end
@testset "Additive structure" begin
@test RG(ones(Int, order(G))) == sum(RG(g) for g in G)
a = RG(ones(Int, order(G)))
b = sum((-1)^parity(g)*RG(g) for g in G)
@test 1/2*(a+b).coeffs == [1.0, 0.0, 1.0, 0.0, 1.0, 0.0]
a = RG(1) + RG(perm"(2,3)") + RG(perm"(1,2,3)")
@test a == RG(1) + perm"(2,3)" + perm"(1,2,3)"
@test a == perm"(2,3)" + (perm"(1,2,3)" + RG(1))
b = RG(1) - RG(perm"(1,2)(3)") - RG(perm"(1,2,3)")
@test b == RG(1) - perm"(1,2)(3)" - perm"(1,2,3)"
@test b == -(perm"(1,2)(3)" - RG(1)) - perm"(1,2,3)"
@test a - b == RG() + perm"(2,3)" + perm"(1,2)(3)" + 2RG(perm"(1,2,3)")
@test 1//2*2a == a
@test a + 2a == (3//1)*a
@test 2a - (1//1)*a == a
end
@testset "Multiplicative structure" begin
for g in G, h in G
a = RG(g)
b = RG(h)
@test a*b == RG(g*h)
@test (a+b)*(a+b) == a*a + a*b + b*a + b*b
end
for g in G
@test star(RG(g)) == RG(inv(g))
@test (RG(1) - g) * star(RG(1) - g) == RG(2) - g - inv(g)
@test aug(RG(1) - g) == 0
end
a = RG(1) + perm"(2,3)" + perm"(1,2,3)"
b = RG(1) - perm"(1,2)(3)" - perm"(1,2,3)"
@test a*b == AbstractAlgebra.mul!(a,a,b)
@test aug(a) == 3
@test aug(b) == -1
@test aug(a)*aug(b) == aug(a*b) == aug(b*a)
z = sum((one(RG) - g)*star(one(RG) - g) for g in G)
@test aug(z) == 0
@test supp(z) == parent(z).basis
@test supp(RG(1) + RG(perm"(2,3)")) == [G(), perm"(2,3)"]
@test supp(a) == [perm"(3)", perm"(2,3)", perm"(1,2,3)"]
end
@testset "HPC multiplicative operations" begin
G = PermutationGroup(6)
RG = GroupRing(zz, G, collect(G), halfradius_length=order(G))
RG2 = GroupRing(zz, G, collect(G), halfradius_length=order(G))
Z = RG()
W = RG()
for g in [rand(G) for _ in 1:30]
X = RG(g)
Y = -RG(inv(g))
for i in 1:10
X[rand(G)] += rand(1:3)
Y[rand(G)] -= rand(1:3)
end
@test X*Y ==
RG2(X)*RG2(Y) ==
GroupRings.mul!(Z, X, Y)
@test Z.coeffs ==
GroupRings._mul!(W.coeffs, X.coeffs, Y.coeffs, RG.pm) ==
W.coeffs
@test (2*X*Y).coeffs ==
GroupRings._addmul!(W.coeffs, X.coeffs, Y.coeffs, RG.pm) ==
GroupRings.scalarmul!(2, X*Y).coeffs
end
end
end
@testset "SumOfSquares in group rings" begin
= star
GroupRings.star(g::GroupElem) = inv(g)
G = FreeGroup(["g", "h", "k", "l"])
S = G.(G.gens)
S = [S; inv.(S)]
ID = G()
RADIUS=3
@time E_R, sizes = Groups.generate_balls(S, ID, radius=2*RADIUS);
@test sizes == [9, 65, 457, 3201, 22409, 156865]
E_rdict = GroupRings.reverse_dict(E_R)
pm = GroupRings.create_pm(E_R, E_rdict, sizes[RADIUS]; twisted=true);
RG = GroupRing(zz, G, E_R, E_rdict, pm)
g, h, k, l = [RG[i] for i in 2:5]
G = (RG(1)- g)
@test G^2 == RG(2) - g - (g)
G, H, K, L = [RG(1) - elt for elt in (g,h,k,l)]
GH = RG(1) - g*h
KL = RG(1) - k*l
X = RG(2) - (g) - h
Y = RG(2) - (g*h) - k
@test -(RG(2) - g*h - (g*h)) + 2G^2 + 2H^2 == X^2
@test RG(2) - g*h - (g*h) == GH^2
@test -(RG(2) - g*h*k - (g*h*k)) + 2GH^2 + 2K^2 == Y^2
@test -(RG(2) - g*h*k - (g*h*k)) +
2(GH^2 - 2G^2 - 2H^2) +
4G^2 + 4H^2 + 2K^2 ==
Y^2
@test GH^2 - 2G^2 - 2H^2 == - X^2
@test -(RG(2) - g*h*k - (g*h*k)) + 4G^2 + 4H^2 + 2K^2 == 2X^2 + Y^2
@test GH^2 == 2G^2 + 2H^2 - (RG(2) - (g) - h)^2
@test KL^2 == 2K^2 + 2L^2 - (RG(2) - (k) - l)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2*GH^2 +
2*KL^2 ==
(RG(2) - (g*h) - k*l)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2(2G^2 + 2H^2 - (RG(2) - (g) - h)^2) +
2(2K^2 + 2L^2 - (RG(2) - (k) - l)^2) ==
(RG(2) - (g*h) - k*l)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2(2G^2 + 2H^2) +
2(2K^2 + 2L^2) ==
(RG(2) - (g*h) - k*l)^2 +
2(RG(2) - (g) - h )^2 +
2(RG(2) - (k) - l )^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2(RG(2) - (g*h*k) - g*h*k) +
2L^2 ==
(RG(2) - (g*h*k) - l)^2
@test RG(2) - (g*h*k) - g*h*k ==
2GH^2 + 2K^2 - (RG(2) - (g*h) - k)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2(2GH^2 + 2K^2 - (RG(2) - (g*h) - k)^2) + 2L^2 ==
(RG(2) - (g*h*k) - l)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2(2GH^2 + 2K^2) + 2L^2 ==
(RG(2) - (g*h*k) - l)^2 +
2(RG(2) - (g*h) - k)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
8G^2 + 8H^2 + 4K^2 + 2L^2 ==
(RG(2) - (g*h*k) - l)^2 +
2(RG(2) - (g*h) - k)^2 +
4(RG(2) - (g) - h)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2GH^2 +
2KL^2 ==
(RG(2) - (g*h) - k*l)^2
@test -(RG(2) - (g*h*k*l) - g*h*k*l) +
2(2G^2 + 2H^2) + 2(2K^2 + 2L^2) ==
(RG(2) - (g*h) - k*l)^2 +
2(RG(2) - (k) - l)^2 + 2(RG(2) - (g) - h)^2
end