Enumeration of rhombus tilings of a hexagon which contain a fixed rhombus on its symmetry axis

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/76387We compute the number of rhombus tilings of a hexagon with sides $N,M,N,N,M,N$, which contain a fixed rhombus on the symmetry axis. A special case solves a problem posed by Jim Propp.21 pages, AmS-LaTeX, uses TeXDraw Extended Abstract, submitted to FPSAC'98Combinatorics05A15 05A19 05B45 52C20Enumeration of rhombus tilings of a hexagon which contain a fixed rhombus on its symmetry axistext