gap> M:=SimplicialK3Surface();;
gap> V:=ConnectedSum(M,M,+1);
Simplicial complex of dimension 4.
gap> W:=ConnectedSum(M,M,-1);
Simplicial complex of dimension 4.
gap> Cohomology(V,2);
[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
gap> Cohomology(W,2);
[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ]
gap> Cohomology(V,4);
[ 0 ]
gap> Cohomology(W,4);
[ 0 ]
gap> cupV:=CupProduct(V);;
gap> cupW:=CupProduct(W);;
gap> AV:=NullMat(44,44);;
gap> AW:=NullMat(44,44);;
gap> gens:=IdentityMat(44);;
gap> for i in [1..44] do
> for j in [1..44] do
> AV[i][j]:=cupV(2,2,gens[i],gens[j])[1];
> AW[i][j]:=cupW(2,2,gens[i],gens[j])[1];
> od;od;
gap> SignatureOfSymmetricMatrix(AV);
rec( determinant := 1, negative_eigenvalues := 22, positive_eigenvalues := 22,
zero_eigenvalues := 0 )
gap> SignatureOfSymmetricMatrix(AW);
rec( determinant := 1, negative_eigenvalues := 6, positive_eigenvalues := 38,
zero_eigenvalues := 0 )
quality 89%
¤ Dauer der Verarbeitung: 0.12 Sekunden
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