Peter Taylor
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 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 2 answered a 2-regular graph is cyclic or not? 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? Aug 19 comment The Day Camp Stacking Game Is rule 4 a repetition of rule 2 or is it trying to say something additional? (I assume that "clockwise" and "left" mean the same thing here). Aug 6 comment Deformable circle from a cubic Bezier approximation What do you mean by "smoothness"? Do you want C2 continuity? G2? Something else? Jul 31 comment Lower bound for a relative of the central binomial coeff @Raphael, can you explain why there's a singularity at $-2+\sqrt{5}$? I see singularities at $-2-\sqrt{5}$ and $\frac{1}{4}$. Jul 30 comment Lower bound for a relative of the central binomial coeff @GerryMyerson, the central binomial coefficient has a rather neat product representation which allows an easy ad hoc proof of the bound. The only way I can see to get a similar product representation is to factor out a central binomial coefficient from each of the binomial coefficients in the second sum. Then bounding with $\frac{1}{\sqrt{m-2j-1}}\ge\frac{1}{\sqrt{m}}$ I get a non-Gosper-summable hypergeometric, and crudely bounding the terms to get a summable geometric sequence gives a worse bound than simply taking the first term of the original sum. Jul 30 comment Prove equivalence of Diffie-Hellman shared secret @codeomnitrix, $a \equiv b\pmod c$ is a shorthand notation for $\exists k : a - b = ck$ Jul 30 asked Lower bound for a relative of the central binomial coeff Jul 23 comment Transforming a latin square into a sudoku @EwanDelanoy, that was my first thought for a counterexample, but just permuting the rows to give leading column $147258369$ suffices. Jul 23 comment Transforming a latin square into a sudoku And similarly for the 9x9 case it should suffice to fix the top-left 6x6 block. Jul 19 answered Factorial Taxicab Number Jul 18 comment What is the count of the strict partitions of n in k parts not exceeding m? The answer to "How many different sets $X_1, \ldots, X_m$...?" would seem to be $m$... Jul 16 comment “I have found a dead body on my car.” This seems to be more a question about the English language than about mathematical logic. Jul 15 awarded Cleanup Jul 15 revised Question regarding permutations and combinations? rolled back to a previous revision Jul 13 comment common multiple polynominal time What is a common multiple of two real numbers? Or, as an alternative phrasing, why is $1$ not always a solution?