Markus Scheuer's user avatar
Markus Scheuer's user avatar
Markus Scheuer's user avatar
Markus Scheuer
  • Member for 10 years, 1 month
  • Last seen this week
  • Austria
40 votes
5 answers
3k views

A nice but somewhat challenging binomial identity

16 votes
5 answers
928 views

When adding zero really counts ...

15 votes
3 answers
652 views

Words built from $\{0,1,2\}$ with restrictions which are not so easy to accomodate.

13 votes
1 answer
661 views

Challenging identity regarding Bell polynomials

12 votes
2 answers
344 views

Drawing balls from an urn or counting certain posets

10 votes
5 answers
208 views

$32$ Goldbach Variations - Papers presenting a single gem in number theory or combinatorics from different point of view

9 votes
1 answer
1k views

Number of binary $M\times N$ matrices with even row sums, even col sums and $K$ ones, $K$ even

7 votes
2 answers
358 views

Enumeration of finite automata

7 votes
2 answers
2k views

Stirling numbers of the second kind: How to obtain a recurrence relation from a generating function?

6 votes
2 answers
263 views

Somewhat challenging binomial identity

5 votes
2 answers
177 views

Looking for a short proof of a harmless looking binomial identity

4 votes
1 answer
175 views

The $n$-th derivative of the reciprocal of a function and a binomial identity

4 votes
1 answer
223 views

Finite double sum $\sum_{k=0}^N\sum_{l=0}^M\left\lfloor\frac{k+l}{c}\right\rfloor$; any advanced summation technique?

3 votes
1 answer
139 views

Collisions with four bullets

3 votes
2 answers
143 views

How to show this identity $\prod_{q=1}^k\frac{1}{1-qz}=\sum_{j=1}^{k}jz\prod_{q=1}^j\frac{1}{1-qz}+1$ avoiding a proof by induction

3 votes
1 answer
363 views

Are there further transformation principles similar to the Inclusion-Exclusion Principle (IEP)?

3 votes
2 answers
232 views

Finite double sum: Improve index transformation

2 votes
1 answer
156 views

Binomial identity: Clever idea for a short proof?

2 votes
1 answer
129 views

Search for an algebraic proof of a near q-Vandermonde identity.

1 vote
1 answer
113 views

FTA/Dormant Model Type - Looking for a simplified derivation of an approximation formula

0 votes
1 answer
162 views

Looking for a smart way to solve a linear PDE with some nice symmetries