A continuous variant of the inverse Littlewood-Offord problem for quadratic forms
A contribution to the second neighborhood problem
A contribution to the Zarankiewicz problem
A converse to Moore's theorem on cellular automata
A convolution formula for the Tutte polynomial
A correct proof of the McMorris-Powers' theorem on the consensus of phylogenies
A correspondence principle between (hyper)graph theory and probability theory, and the (hyper)graph removal lemma
A counterexample to a conjecture of Björner and Lovász on the $χ$-coloring complex
A counterexample to a conjecture of Laurent and Poljak
A counterexample to conjecture 18.5 in "Geometric Etudes in Combinatorial Mathematics", second edition
A counterexample to the Alon-Saks-Seymour conjecture and related problems
A counterexample to the Hirsch conjecture
A counterexample to Wegner's conjecture on good covers
A Counting Proof of the Graham Pollak Theorem
A criterion for the half-plane property
A Criterion for Vertex Colorability of a Graph Stated in Terms of Edge Orientations
A cubical antipodal theorem
A curious $q$-analogue of Hermite polynomials
A de Bruijn - Erdős theorem and metric spaces
A De Bruijn-Erdos theorem for chordal graphs