An explanatory bijection of some properties of bridges. (Une bijection explicative de plusieurs propriétés de ponts.)
An exploration of the permanent-determinant method.
An extension of a criterion for unimodality.
An extension of Franklin's bijection.
An extension of the exponential formula in enumerative combinatorics.
An extension of the Foata map to standard Young tableaux.
An extension of the Ramanujan-Bailey formula. (Une extension d'une formule de Ramanujan-Bailey.)
An identity for fixed points of permutations.
An identity for the independence polynomials of trees.
An identity generator: basic commutators.
An inductive proof of Whitney's Broken Circuit Theorem
We present a new proof of Whitney's broken circuit theorem based on induction on the number of edges and the deletion-contraction formula.
An inequality related to two integer sequences satisfying an order condition.
An infinite antichain of permutations.
An infinite family of dual sequence identities.
An infinite version of the Pólya enumeration theorem.
An interesting new Mahonian permutation statistic.
An introduction to clobber.
An introduction to finite fibonomial calculus
This is an indicatory presentation of main definitions and theorems of Fibonomial Calculus which is a special case of ψ-extented Rota's finite operator calculus [7].
An introduction to -species.
An invariant sum related to record statistics.