Group cohomology · cohomology theory associated to a group 𝐺 and a 𝐺‐module · YYNN

Group cohomology

? TBD

cohomology theory associated to a group 𝐺 and a 𝐺‐module

Ratings 0

Nobody has rated this yet. Be the first!

Discussions 1

But there are 7 other non-split extensions! These give nontrivial elements of the cohomology group H²(P, ℤ³).

Thus, the hardest part of classifying all 13 monoclinic space groups is figuring out H²(P, ℤ³) for all 6 choices of P and its action on ℤ³.

(12/n)

en.wikipedia.org/wi...

Bluesky post by @johncarlosbaez.bsky.social

Lists 0