Prove that players in round-robin tournament can be ordered
108508
Prove that every tournament contains at least one Hamiltonian path.
110876
Prove that $p\mid \binom{p}{k},\ 0< k< p$
120522
Showing any countable, dense, linear ordering is isomorphic to a subset of $\mathbb{Q}$
91217
Arbitrarily ordering records in a table
43076
Chess tournament combinatorics
146984
Prove: Full Rank and a solution os linear system
99435
Proof of the inclusion-exclusion formula in probability
106827
Proof for two sequences producing the maximum value when sorted
141534
Doubles rules in table tennis
15452
Proving determinant product rule combinatorially
10272
A three-way duel (probability puzzle)
43764
Prove $P_m X P_n$ is Hamiltonian if and only if at least one of $m,n$ is even
62936
Proving equivalencies of two versions of the Axiom of Choice
97254
What is the proof of permutations of similar objects?
146062
A "Cantor-Schroder-Bernstein" theorem for partially-ordered-sets
30003
Proving that Order for N is Anti-symmetric
140106
How to prove a finite field is not ordered?