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Sep
12
answered Partial sums of Nicomachus' Triangle rows produce Stirling numbers of the 2nd kind?
Sep
11
answered Maximum value of $a+b$ given that $\frac{1}{a} + \frac{1}{b} = \frac{1}{20}$
Sep
2
answered a 2-regular graph is cyclic or not?
Aug
30
answered Pushdown Automata and Challenge in Grammar
Aug
7
answered PRIMES is in P, Lemma 4.7: Why are $t$ roots in a polynomial of degree $< t$ a contradiction, if we don't know that the polynomial is not zero?
Jul
30
asked Lower bound for a relative of the central binomial coeff
Jul
19
answered Factorial Taxicab Number
Jul
11
answered Graph Theory, with algorithms like kruskal and something more
Jun
20
answered Source coding and Entropy
Jun
20
answered Closed form for the Stirling numbers of the second kind.
Jun
16
asked History of a combinatoric problem: exchanging numbers by throwing stones
Jun
12
answered How do you create a nonlinear game that the player can always win?
Jun
3
answered Probability a polynomial has a root which is a root of unity
May
15
answered Turing Machine Decidability
May
13
answered Non-inductive, not combinatorial proof of $\sum_{i \mathop = 0}^n \binom n i^2 = \binom {2 n} n$
May
13
answered Unbounded sequence with convergent subsequence
Apr
25
answered Repeating cycles in the $3n-1$ problem
Apr
8
answered Round Robin for Team Matches
Mar
16
answered Distinguishing between hash function digest and message corruption
Mar
10
answered What is the pupose of using minute and seconds with degree?