Peter Taylor
Reputation
4,772
Top tag
Next privilege 5,000 Rep.
Approve tag wiki edits
 Oct10 revised Counting all possible board positions in Quoridor added 152 characters in body Oct10 answered Counting all possible board positions in Quoridor Oct6 reviewed Close Integrating by splitting up trig functions Oct6 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. Oct6 answered How to prove 2 is a primitive root mod 37, without calculating all powers of 2 mod 37? Sep30 awarded Explainer Sep22 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. Sep15 reviewed Close What are the root of $x^3 - 2$ $\in \mathbb{R}[x]$? Sep13 reviewed Reopen condition for transitivity Sep12 revised Partial sums of Nicomachus' Triangle rows produce Stirling numbers of the 2nd kind? added 1110 characters in body Sep12 answered Partial sums of Nicomachus' Triangle rows produce Stirling numbers of the 2nd kind? Sep11 revised 4-part partitions of n and 3n deleted 90 characters in body; edited tags; edited title Sep11 answered Maximum value of $a+b$ given that $\frac{1}{a} + \frac{1}{b} = \frac{1}{20}$ Sep10 reviewed Reject Sign of a series Sep5 reviewed Close Series expansion of $\log(1+x^2)$ Sep2 answered a 2-regular graph is cyclic or not? Aug30 reviewed Close Prove a condition for a Banach algebra Aug30 answered Pushdown Automata and Challenge in Grammar Aug23 reviewed Leave Open Generating function for binomial coefficients $\binom{2n+k}{n}$ with fixed $k$ Aug20 reviewed Close In how many ways can a number be expressed as a sum of squares of two natural numbers?