MacMahon's theorem for a set of permutations with given descent indices and right-maximal records.
MacMahon-type identities for signed even permutations.
Magic squares, rook polynomials and permutations.
Mappings of Acyclic and Parking Functions.
Matchings and partial patterns.
Matchings avoiding partial patterns.
Matchings avoiding partial patterns and lattice paths.
Matchings in infinite graphs
Mathematics of Ghaly's machine.
Meanders and Motzkin words.
Mesh patterns and the expansion of permutation statistics as sums of permutation patterns.
Minimal transitive products of transpositions---the reconstruction of a proof of A. Hurwitz.
Monotonic subsequences in dimensions higher than one.
More on k-Sets of Finite Sets in the Plane.
More statistics on permutation pairs.
Motzkin paths and reduced decompositions for permutations with forbidden patterns.
Multiple pattern avoidance with respect to fixed points and excedances.
Multi-static enumeration of two-stack sortable permutations.