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On Addition Formulae of KP, mKP and BKP Hierarchies

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arxiv 1212.1952 v3 pith:ZIW6JQM3 submitted 2012-12-10 nlin.SI math-phmath.MPmath.QA

On Addition Formulae of KP, mKP and BKP Hierarchies

classification nlin.SI math-phmath.MPmath.QA
keywords hierarchiesadditionformulaecasealternativeappliedbeendirect
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In this paper we study the addition formulae of the KP, the mKP and the BKP hierarchies. We prove that the total hierarchies are equivalent to the simplest equations of their addition formulae. In the case of the KP and the mKP hierarchies those results had previously been proved by Noumi, Takasaki and Takebe by way of wave functions. Here we give alternative and direct proofs for the case of the KP and mKP hierarchies. Our method can equally be applied to the BKP hierarchy.

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  1. Baxter Q-operators from a Schwinger-Boson construction of the master T-operator and the mKP hierarchy

    math-ph 2026-07 accept novelty 6.0

    A Schwinger-boson Fock-space trace defines the gl(M) master T-operator, and the same L-operator degenerates to the Q-operator L-operator of Bazhanov–Frassek–Lukowski–Meneghelli–Staudacher.