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 Apr 28 revised Representable Functors and Upper Sets (Final Segments) added 2 characters in body Mar 21 accepted Measures which are constant when not zero Mar 21 comment Measures which are constant when not zero So do I call it "The Dirac measure for the subset $\{a,b,e\}$"? Mar 21 comment Measures which are constant when not zero I mean, is there a name for a measure which is constant except when it's zero? Mar 21 asked Measures which are constant when not zero Mar 21 accepted Proof of Wikipedia formula about Ricci curvature Mar 21 awarded Enlightened Mar 21 awarded Nice Answer Mar 17 awarded Necromancer Mar 13 revised Proof of Wikipedia formula about Ricci curvature added 2 characters in body Mar 13 answered Proof of Wikipedia formula about Ricci curvature Mar 13 comment Proof of Wikipedia formula about Ricci curvature Yes, it's a determinant. But a very complicated one. That's why I would like to see the calculation done somewhere, or at least some tricks to simplify the math... Mar 13 asked Proof of Wikipedia formula about Ricci curvature Mar 13 comment Why are “is equal to” and “total strict ordering” mutually exclusive? @GitGud Oh yes, sorry. Not enough coffee this morning! Mar 13 comment Why are “is equal to” and “total strict ordering” mutually exclusive? By definition of strict total ordering. A strict order relation is anti-symmetric. Mar 11 awarded Popular Question Mar 8 comment Does a function between sets induce a homomorphism between the respective permutation groups? @GerryMyerson Yeah, exactly. Are there some conditions to avoid this case (other than injectivity)? Mar 8 asked Does a function between sets induce a homomorphism between the respective permutation groups? Mar 5 awarded Revival Mar 4 accepted Where can I found an explanation of group cohomology from the point of view of invariants?