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earned this badge 176 times.
Combinatorial Techniques for Counting Conjugacy Classes
Awarded Feb 12, 2012 at 8:35
What are the connections between pi and prime numbers?
Awarded Jan 27, 2012 at 6:35
Linear algebra proofs in combinatorics?
Awarded Jan 21, 2012 at 18:20
Mathematicians who were late learners?-list
Awarded Sep 22, 2011 at 6:20
Lifting matrices mod 2 to integers.
Awarded Sep 5, 2011 at 20:50
What are the worst notations, in your opinion?
Awarded Jun 10, 2011 at 23:20
What role does Cauchy's determinant identity play in combinatorics?
Awarded Jun 7, 2011 at 16:50
Derangements with repetition
Awarded May 26, 2011 at 0:35
What are some mathematical concepts that were (pretty much) created from scratch and do not owe a debt to previous work?
Awarded May 10, 2011 at 7:50
What are some correct results discovered with incorrect (or no) proofs?
Awarded May 8, 2011 at 7:35
Examples of eventual counterexamples
Awarded May 4, 2011 at 9:50
Counterexamples in algebra?
Awarded Apr 23, 2011 at 22:20
Math puzzles for dinner
Awarded Apr 14, 2011 at 3:05
How many surjections are there from a set of size n?
Awarded Mar 28, 2011 at 5:20
What is the shortest program for which halting is unknown?
Awarded Mar 14, 2011 at 4:50
Counting the Groups of Order n Weighted by 1/|Aut(G)|
Awarded Mar 14, 2011 at 0:20
Examples of common false beliefs in mathematics
Awarded Feb 28, 2011 at 17:20
What is Lagrange Inversion good for?
Awarded Feb 28, 2011 at 15:50
Why were matrix determinants once such a big deal?
Awarded Feb 7, 2011 at 20:20
What's your favorite equation, formula, identity or inequality?
Awarded Dec 11, 2010 at 4:35
Is all ordinary mathematics contained in high school mathematics?
Awarded Nov 8, 2010 at 5:05
Jokes in the sense of Littlewood: examples?
Awarded Oct 21, 2010 at 8:05
Have any long-suspected irrational numbers turned out to be rational?
Awarded Oct 17, 2010 at 16:20
Generalizing a problem to make it easier
Awarded Oct 16, 2010 at 13:20
David Gale's subset take-away game
Awarded Oct 13, 2010 at 3:05
Convert integer to permutation number
Awarded Sep 30, 2010 at 12:05
How to prove that every real number is a zero of some power series with rational coefficients (if true)
Awarded Sep 28, 2010 at 18:35
Suggestions for good notation
Awarded Sep 27, 2010 at 2:20
Wonderful applications of the Vandermonde determinant
Awarded Sep 26, 2010 at 2:20
Pseudonyms of famous mathematicians
Awarded Sep 17, 2010 at 4:20
Theorems that are 'obvious' but hard to prove
Awarded Sep 1, 2010 at 23:35
Why should one still teach Riemann integration?
Awarded Aug 25, 2010 at 11:20
How to place k bishops on an nxn chessboard
Awarded Aug 22, 2010 at 3:35
Why were plane partitions invented?
Awarded Aug 19, 2010 at 4:50
Examples of common false beliefs in mathematics
Awarded Aug 18, 2010 at 16:05
A question about an application of Molien's formula to find the generators and relations of an invariant ring
Awarded Aug 17, 2010 at 21:05
Partitions to different parts not exceeding $n$
Awarded Aug 3, 2010 at 21:35
Integer sequences and integer coefficients in recurrence relations.
Awarded Jul 17, 2010 at 10:35
What are the external triumphs of matroid theory?
Awarded Jun 29, 2010 at 22:05
Upper bounds on the permanent of dense 0-1 matrix
Awarded Jun 26, 2010 at 16:20
Integrating the multinomial over a hypercube
Awarded Jun 13, 2010 at 13:20
Asymptotic Methods in Combinatorics
Awarded Jun 11, 2010 at 15:35
The number of pairings between multisets
Awarded May 19, 2010 at 3:05
Fastest growing set of odd numbers such that any even number can be expressed as the sum of two elements.
Awarded May 3, 2010 at 0:20
Irreducibility for multivariate polynomial polynomial generated from sum of irreducible polynomial in one variable
Awarded Apr 18, 2010 at 17:50
Most 'unintuitive' application of the Axiom of Choice?
Awarded Apr 11, 2010 at 20:05
What is the generating function for skew Young diagrams?
Awarded Apr 8, 2010 at 4:20
Is there an "elegant" non-recursive formula for these coefficients? Also, how can one get proofs of these patterns?
Awarded Mar 27, 2010 at 10:35
Symmetric distribution of maj over des in pattern avoidance classes
Awarded Mar 20, 2010 at 23:05
A random walk with uniformly distributed steps
Awarded Mar 18, 2010 at 16:21
Using Exterior Algebras in combinatorics
Awarded Mar 15, 2010 at 6:50
Not especially famous, long-open problems which anyone can understand
Awarded Mar 4, 2010 at 13:06
Not especially famous, long-open problems which anyone can understand
Awarded Feb 25, 2010 at 14:37
Tensor powers of the standard representation
Awarded Jan 27, 2010 at 14:35
what is the probability that a scissor became the champion?
Awarded Dec 26, 2009 at 7:20
Salié permutations and fair permutations
Awarded Dec 26, 2009 at 7:05
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