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seen Sep 19 '13 at 21:15

May
12
awarded  Nice Answer
May
8
awarded  Nice Answer
Apr
29
comment Verifying the correctness of a Sudoku solution
I think the tag compressed-sensing could be added to this post. nuit-blanche.blogspot.co.uk/2013/04/… goo.gl/xl3EQ
Apr
21
answered Is rigour just a ritual that most mathematicians wish to get rid of if they could?
Feb
23
awarded  Necromancer
Feb
22
answered Philosophy behind Mochizuki's work on the ABC conjecture
Feb
12
awarded  Student
Feb
11
awarded  Critic
Feb
9
comment Trichotomies in mathematics
mathoverflow.net/questions/22927/…
Feb
9
comment Trichotomies in mathematics
mathoverflow.net/questions/13029/…
Feb
9
comment Trichotomies in mathematics
mathoverflow.net/questions/40178/freshmans-definition-of-sinx/…
Feb
8
comment Trichotomies in mathematics
For a Riemannian signature Einstein AH structure on a compact n-manifold there holds one of the following mutually exclusive possiblities: 1) It is proper and exact with parallel scalar curvature. 2) Its scalar curvature is identically zero and it is closed. 3) It is not closed, and its scalar curvature is not parallel. arxiv.org/pdf/1203.2575
Feb
8
comment Trichotomies in mathematics
Structure of Kac–Moody algebras: finite type, affine type, and wild type.
Feb
8
comment Trichotomies in mathematics
Tautology/contingency/absurdity for propositional forms and the analogous valid/satisfiable/unsatisfiable. books.google.com/books?id=t5r79vZ9ogoC&pg=PA75
Feb
8
comment Trichotomies in mathematics
An infinite locally finte homogenneous geometry is isomorphic to 1) trivial geometry, 2) projective geometry over a finite field, or 3) affine geometry over a finite field. books.google.com/books?id=8NTWRFD5lZ8C&pg=PA367
Feb
6
comment Ring with three binary operations
Or the minimum function. Or any subring of $\mathbb{R}$ such as $\mathbb{Q}$, $\mathbb{Z}$, $\mathbb{Q(\sqrt{2})}$.
Feb
5
comment Ring with three binary operations
Related question: mathoverflow.net/questions/110378/…
Feb
4
comment Trichotomies in mathematics
Underdetermined, determined, overdetermined.
Feb
4
awarded  Commentator
Feb
4
comment Trichotomies in mathematics
SubX, X, superX.