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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?