A Residue Theorem for Malcev-Neumann Series

Details A Residue Theorem for Malcev-Neumann Series A Residue Theorem for Malcev-Neumann Series

2004-09-11

arxiv.org/abs/math/0409190v2

Mathematics

Combinatorics

22 pages, extensive revision

Scientific paper

In this paper, we establish a residue theorem for Malcev-Neumann series that requires few constraints, and includes previously known combinatorial residue theorems as special cases. Our residue theorem identifies the residues of two formal series that are related by a change of variables. We obtain simple conditions for when a change of variables is possible, and find that the two related formal series in fact belong to two different fields of Malcev-Neumann series. The multivariate Lagrange inversion formula is easily derived and Dyson's conjecture is given a new proof and generalized.

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