Random triples
| Subject | Object |
|---|---|
| gptkb:Dixmier–Douady_class | H^3(X, Z) |
| gptkb:Hecke_character | complex numbers |
| gptkb:Dixmier–Douady_class | third cohomology group |
| gptkb:Kirby–Siebenmann_invariant | H^4(M;Z/2Z) |
| gptkb:Stiefel-Whitney_class | cohomology with Z/2Z coefficients |