
arXiv: 0804.4716
A recent breakthrough in the theory of (type A) Macdonald polynomials is due to Haglund, Haiman and Loehr, who exhibited a combinatorial formula for these polynomials in terms of a pair of statistics on fillings of Young diagrams. Ram and Yip gave a formula for the Macdonald polynomials of arbitrary type in terms of so-called alcove walks; these originate in the work of Gaussent-Littelmann and of the author with Postnikov on discrete counterparts to the Littelmann path model. In this paper, we relate the above developments, by explaining how the Ram-Yip formula compresses to a new formula, which is similar to the Haglund-Haiman-Loehr one but contains considerably fewer terms.
Mathematics(all), Symmetric functions and generalizations, Alcove walks, 05E05; 33D52, 33D52, Basic orthogonal polynomials and functions associated with root systems (Macdonald polynomials, etc.), Haglund-Haiman-Loehr formula, Ram-Yip formula, Combinatorial aspects of representation theory, 05E05, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO), Representation Theory (math.RT), MacDonald polynomials, Mathematics - Representation Theory
Mathematics(all), Symmetric functions and generalizations, Alcove walks, 05E05; 33D52, 33D52, Basic orthogonal polynomials and functions associated with root systems (Macdonald polynomials, etc.), Haglund-Haiman-Loehr formula, Ram-Yip formula, Combinatorial aspects of representation theory, 05E05, FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO), Representation Theory (math.RT), MacDonald polynomials, Mathematics - Representation Theory
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