Mike Spivey's user avatar
Mike Spivey's user avatar
Mike Spivey's user avatar
Mike Spivey
  • Member for 13 years, 6 months
  • Last seen more than a week ago
14 votes
1 answer
2k views

Combinatorial proof for the number of lattice paths that return to the axis only at times that are a multiple of 4

4 votes
1 answer
459 views

Maximum vertical distance for a lattice path when NSEW steps are allowed

38 votes
5 answers
6k views

When does symmetry in an optimization problem imply that all variables are equal at optimality?

18 votes
3 answers
1k views

Partitioning the integers $1$ through $n$ so that the product of the elements in one set is equal to the sum of the elements in the other

6 votes
4 answers
906 views

Can this nested sum be expressed in terms of generalized harmonic numbers and the cycle index polynomials of the symmetric groups?

5 votes
0 answers
344 views

When does a triangle of numbers have a zero row sum?

9 votes
2 answers
778 views

Asymptotic difference between a function and its "binomial average"

6 votes
4 answers
2k views

Laplace's summation formula

8 votes
2 answers
2k views

How does a tournament's structure affect the likelihood that the best player will win?

9 votes
3 answers
2k views

Solving a general two-term combinatorial recurrence relation