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Jul
25
awarded  Good Question
Jul
20
awarded  Yearling
Jul
5
comment Solve a Quadratic map
I don't see how to "eliminate $b$ by a translation." can you elaborate?
May
21
asked Estimate of sum of divisors up to a certain number?
May
14
comment System of linear congruence, not relatively prime
I need reference on the actual complexity of any known algorithm. I feel this is more likely to be known to crypto people.
May
14
asked System of linear congruence, not relatively prime
May
9
awarded  Custodian
May
9
reviewed Approve Index notation for group multiplication and commutators
Feb
20
accepted Is this function submodular?
Jan
31
comment How to compute the image of a polyhedron under a linear transformation
This cannot be true. Since this implies polytope $P'$ has at most $n$ facets. But there are examples where after a projection, the polytope has $2^n$ facets. lall.stanford.edu/data/engr210b_0405/… see slide 15
Jan
28
revised Can ${n \choose 2}$ points be covered by lines determined by $n$ points?
update to remove degenerate case.
Jan
28
asked Can ${n \choose 2}$ points be covered by lines determined by $n$ points?
Jan
23
accepted Compute the generalization of average
Jan
22
asked Compute the generalization of average
Jan
10
awarded  Popular Question
Jan
4
awarded  Notable Question
Nov
11
awarded  Popular Question
Oct
21
awarded  Notable Question
Oct
4
comment What is the shortest string that contains all permutations of an alphabet?
The conjecture has been disproved. See the arxiv post here. arxiv.org/abs/1408.5108.
Oct
1
awarded  Notable Question