Random orders and gambler's ruin.
Random Young tableaux and combinatorial identities.
Rational identities and inequalities.
rc-graphs and Schubert polynomials.
Recurrence relations and two-dimensional set partitions.
Recurrences and Legendre transform.
Recursive determination of the enumerator for sums of three squares.
Recursive generation of -ary trees.
Reduced decompositions of matchings.
Resolución de una conjetura sobre la fórmula: Σ(-l)i(ni)ij=0,n>j≥0.
Rhombus tilings of a hexagon with two triangles missing on the symmetry axis.
Riordan arrays, Sheffer sequences and “orthogonal” polynomials.
Rogers-Ramanujan identities: A century of progress from mathematics to physics.
Rogers-Ramanujan-Slater type identities.
RSK insertion for set partitions and diagram algebras.