Cylindric Partitions

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Abstract
A new object is introduced into the theory of partitions that generalizes plane partitions: cylindric partitions. We obtain the generating function for cylindric partitions of a given shape that satisfy certain row bounds as a sum of determinants of q q -binomial coefficients. In some special cases these determinants can be evaluated. Extending an idea of Burge (J. Combin. Theory Ser. A 63 (1993), 210–222), we count cylindric partitions in two different ways to obtain several known and new summation and transformation formulas for basic hypergeometric series for the affine root system A ~ r \widetilde A_{r} . In particular, we provide new and elementary proofs for two A ~ r \widetilde A_{r} basic hypergeometric summation formulas of Milne (Discrete Math. 99 (1992), 199–246).

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