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1d
reviewed Close Looking for comparison of the “cost” of computation of two algorithms
Dec
25
awarded  Enlightened
Dec
25
reviewed Close How to calculate the center of a regular polygon?
Dec
24
awarded  Nice Answer
Dec
23
awarded  Nice Answer
Dec
23
comment Generalization of Sylvester-Gallai theorem
@Dal: The proof uses some considerations using the Euler characteristic, results on points on (cubic) curves, and ideas from additive combinatorics to force structure in configurations having few ordinary lines. You could also look at Tao's blog post: terrytao.wordpress.com/2012/08/24/…
Dec
23
revised Generalization of Sylvester-Gallai theorem
edited tags
Dec
23
answered Generalization of Sylvester-Gallai theorem
Dec
22
reviewed Leave Closed Linear algebra over principal rings 1
Dec
22
reviewed Leave Open Combinations Question about the construction of some special sets
Dec
21
reviewed Close Stochastical Independence V.S. Functions of Random Variables
Dec
20
reviewed Leave Open Real algebraic solution
Dec
20
reviewed Leave Closed Beginners Guide to Cartan for Beginners
Dec
20
comment Cardinality of the prime divisor set of a k-power sum
This follows from the finiteness of solutions to the $S$-unit equation. See for example the main theorem in math.uwaterloo.ca/pure-mathematics/sites/ca.pure-mathematics/… . Maybe there's an easier proof ...
Dec
20
reviewed Leave Closed Connected components $0-1$ matrices
Dec
18
reviewed No Action Needed combinatorial rectangles
Dec
18
comment Graduate program applications that require questionnaires and other non-letter material
By the way, even the streamlined process we now have for MathJobs might be under threat -- this year, three universities made me upload letters for job candidates at their website rather than getting it themselves from Math Jobs. (Rochester, Vermont and North Carolina). I hope this infection doesn't spread, or that people will take steps in advance to resist it before too late.
Dec
18
reviewed Leave Closed Which universities teach true infinitesimal calculus?
Dec
18
reviewed Close Fourier transform of a matrix represented compact lie group
Dec
17
reviewed Leave Open Graduate program applications that require questionnaires and other non-letter material