2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/174932In his landmark paper, Zhu associated two associative algebras to a vertex operator algebra: what are now called Zhu's algebra and the C_2-algebra. The former has a nice interpretation in terms of the representation theory of the VOA, while the latter only serves as a finiteness condition. In this paper we undertake first steps to unravel the interpretation of the C_2 vector space. In particular we suggest that it seems and controls the twisted representations of the VOA.14 pagesQuantum AlgebraHigh Energy Physics - TheoryRepresentation Theory17B69, 81T40text