423

Answers

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38

a categorical Nakayama lemma?

3

Pell Numbers and the Primes

5

Lower bound for sum of square root of the degrees of a connected graph

9

How many Perfect Matchings in a regular bipartite Graph

7

Trying to solve: Show that n does not divide 3^n - 2^n for n greater than or equal to 2.

9

Can a harmonic number be a rational number for non-integer rational argument?

2

Formalization (and background) of a formula, concering the integral points of a polygon.

4

Estimate on sum of squares of multinomial coefficients

16

Access to a preprint by D. N. Verma

2

principal specialization of projective Schur functions

9

A “known” Pythagorean identity in algebra?

5

Immersed surface with circle as a boundary

5

A question on the Laurent phenomenon

7

Integral transform and $\frac{1}{n!}$.

1

Reduction of $f$-solubility to $1$-factor

4

series expansion of the q-Pochhammer symbol

6

Partitions into parts from an arithmetic progresion

6

A special case of Catalan’s conjecture

5

Number of forests of size $i$ and the Tutte polynomial

5

Irrationality measure of formal power series

9

Are two elements of a group determined up to simultaneous conjugacy by the conjugacy classes of all of their products?

8

Hopf algebras and bijective antipodes

3

Chromatic number of the power set

12

A generalization of Catalan numbers

5

In which geometries do triangles have a Euler-line ?

6

Coloring tensor products of graphs

2

inversion vector for multiset permutation

11

Proof of a combinatorial identity (possibly using trigonometric identities)

10

Alternating sums of alternate Stirling numbers

8

Automorphisms of a certain digraph defined on the set of primes? [Edited]