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Tree algebras: An algebraic axiomatization of intertwining vertex operators

Igor Kříž, Yang Xiu (2012)

Archivum Mathematicum

We describe a completely algebraic axiom system for intertwining operators of vertex algebra modules, using algebraic flat connections, thus formulating the concept of a tree algebra. Using the Riemann-Hilbert correspondence, we further prove that a vertex tensor category in the sense of Huang and Lepowsky gives rise to a tree algebra over . We also show that the chiral WZW model of a simply connected simple compact Lie group gives rise to a tree algebra over .

Un problema di Riemann-Hilbert non regolare per una coppia di operatori ellittici di ordine 2 m .

Mario Tosques (1984)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

We consider the problem of finding a couple of solutions ( u + , u - ) satisfying the following conditions (4) and (5) for a couple of two uniformly elliptic partial differential operators A + and A - of order 2 m in a non regular situation.

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