Macdonald polynomials have become central objects of study in the theory of symmetric functions. Descouens and Morita proved a factorization formula for the modified Macdonald polynomial when one parameter is set to a root of unity using symmetric function identities. They pose the problem of finding a bijective proof of this factorization using Haglund's combinatorial formula. In this talk I present a bijective proof of the factorization as well as a discussion of the univariate symmetry of the polynomials. This is joint work with Nicholas Loehr.
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