Quelle  2.8.5   Sprache: unbekannt

gens:=
      [ [ [-1,0,0,0], [0,-1,0,0], [0,0,1,1/2], [0,0,0,1] ],
      [ [0,-1,0,0], [1,-1,0,0], [0,0,1,1/3], [0,0,0,1] ],
      [ [1,0,0,1], [0,1,0,0], [0,0,1,0], [0,0,0,1] ] ];;
G:=AffineCrystGroupOnLeft(gens);;
G:=StandardAffineCrystGroup(G);;
G:=Image(IsomorphismPcpGroup(G));;
E_G:=Resolution(G,4);;
C:=HomToIntegers(E_G);
Print(Cohomology(C,1),"\n");
Print(Cohomology(C,2),"\n");
Print(Cohomology(C,3),"\n"); 
Print(CupProduct(E_G,1,2,[1],[1]),"\n");

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