2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63292Let L be a rank one positive definite even lattice. We prove that a vertex operator algebra (VOA) V_L^+ satisfies the C_2 condition. Here, V_L^+ is a fixed point sub-VOA of the VOA V_L associated with the automorphism lifted from the -1 isometry of L.26 pagesQuantum Algebra17B69C_2 cofiniteness of vertex operator algebra V_L^+ when L is a rank one latticetext