@OscarCunningham@mathstodon.xyz
Post #1844255
2026-05-01 11:52 UTC
@slava This is also related to the braid group on three strands, B₃ = .
Replies (1)
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@slava@mathstodon.xyz 2026-05-01 12:46
@OscarCunningham Ah that’s interesting, so Grp is isomorphic to Grp, but the monoids with the same presentation are not isomorphic, because their commutative quotients are different! Here is , which is not even cancellative: https://monoids.net/2,2/7190.html