On the shadow of squashed families of -sets.
On the Stanley-Wilf conjecture for the number of permutations avoiding a given pattern.
On the subspace of .
On the symmetries of the -Bernoulli polynomials.
On the system of all maximal chains (antichains) of a graph.
On the -core of an -core partition.
On the theory of Pfaffian orientations. I: Perfect matchings and permanents.
On the theory of Pfaffian orientations. II: -joins, -cuts, and duality of enumeration.
On the uniform generation of modular diagrams.
On the volume of a certain polytope.
On the volume of the polytope of doubly stochastic matrices.
On two combinatorial identities
On two supercongruences involving Almkvist-Zudilin sequences
We prove two supercongruences involving Almkvist-Zudilin sequences, which were originally conjectured by Z.-H. Sun (2020).
On unimodality problems in Pascal's triangle.
On useful schema in survival analysis after heart attack
Recent model of lifetime after a heart attack involves some integer coefficients. Our goal is to get these coefficients in simple way and transparent form. To this aim we construct a schema according to a rule which combines the ideas used in the Pascal triangle and the generalized Fibonacci and Lucas numbers
On weak convergence of sequences of measures
On Zeilberger's constant term for Andrew's TSSCPP theorem.
One-dimensional game of life and its growth functions.
One-pile misère Nim for three or more players.
On-line Ramsey theory.