16

Answers

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8

Permutations with restriction

3

Giving a math talk with no blackboard or projector

8

Gale-Ryser stable marriage theorem: can we entrust matchmaking to monkeys?

5

Generalization of a horse-racing puzzle

43

Are there more connected or disconnected graphs on n vertices?

4

Combinatorial results without known combinatorial proofs

6

What are some good examples of non-monotone graph properties?

3

Generalization of Finch Cheney’s 5 Card Trick

0

Axiom of Choice and Order Types

1

Graphs preserved under the Hamiltonian path operator

5

Hardness of combinatorial optimization after adding one constraint (2)

2

How do I iterate over binary trees?

1

Variant of binomial coefficients

12

What is the first interesting theorem in (insert subject here)? (2)

11

Can I finitely color Z^2 such that (x,a) and (a,y) are different for every x,y,a?

1

Placing checkers with some restrictions