Pfaffian and hafnian identities in shuffle algebras

Details Pfaffian and hafnian identities in shuffle algebras Pfaffian and hafnian identities in shuffle algebras

2002-04-02

arxiv.org/abs/math/0204026v2

Mathematics

Combinatorics

28 pages, LaTex. Minor typos corrected, two references added

Scientific paper

Chen's lemma on iterated integrals implies that certain identities involving multiple integrals, such as the de Bruijn and Wick formulas, amount to combinatorial identities for Pfaffians and hafnians in shuffle algebras. We provide direct algebraic proofs of such shuffle identities, and obtain various generalizations. We also discuss some Pfaffian identities due to Sundquist and Ishikawa-Wakayama, and a Cauchy formula for anticommutative symmetric functions. Finally, we extend some of the previous considerations to hyperpfaffians and hyperhafnians.

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