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Oct
10
revised Counting all possible board positions in Quoridor
added 152 characters in body
Oct
10
answered Counting all possible board positions in Quoridor
Oct
6
reviewed Close Integrating by splitting up trig functions
Oct
6
comment Can anyone extend my findings for Langford Pairings?
I don't actually see a question. If this is an attempt to follow David Eppstein's advice that for your ideas to be included in the Wikipedia page on Langford pairing you should first get them published, then you should be aware that he was talking about publication in a peer-reviewed journal, not on a Q&A site.
Oct
6
answered How to prove 2 is a primitive root mod 37, without calculating all powers of 2 mod 37?
Sep
30
awarded  Explainer
Sep
22
comment No simple closed form for Bell numbers
The premise of your question is somewhat unclear, because "closed form" is a somewhat variable quantity. Unless you allow factorials in a closed form, I can't think of any basic combinatorial quantity which has one. Allowing them lets in binomial coefficients and therefore Catalan numbers, but what else? Such basic combinatorial quantities as Stirling numbers and the partition function don't have well-known closed forms.
Sep
15
reviewed Close What are the root of $x^3 - 2$ $\in \mathbb{R}[x]$?
Sep
13
reviewed Reopen condition for transitivity
Sep
12
revised Partial sums of Nicomachus' Triangle rows produce Stirling numbers of the 2nd kind?
added 1110 characters in body
Sep
12
answered Partial sums of Nicomachus' Triangle rows produce Stirling numbers of the 2nd kind?
Sep
11
revised 4-part partitions of n and 3n
deleted 90 characters in body; edited tags; edited title
Sep
11
answered Maximum value of $a+b$ given that $\frac{1}{a} + \frac{1}{b} = \frac{1}{20}$
Sep
10
reviewed Reject Sign of a series
Sep
5
reviewed Close Series expansion of $\log(1+x^2)$
Sep
2
answered a 2-regular graph is cyclic or not?
Aug
30
reviewed Close Prove a condition for a Banach algebra
Aug
30
answered Pushdown Automata and Challenge in Grammar
Aug
23
reviewed Leave Open Generating function for binomial coefficients $\binom{2n+k}{n}$ with fixed $k$
Aug
20
reviewed Close In how many ways can a number be expressed as a sum of squares of two natural numbers?