2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/60786We consider a class of weak modules for vertex operator algebras that we call logarithmic modules. We also construct nontrivial examples of intertwining operators between certain logarithmic modules for the Virasoro vertex operator algebra. At the end we speculate about some possible logarithmic intertwiners at the level $c=0$.Revised versionQuantum AlgebraPrimary 17B69, 17B68; Secondary 17B10, 81R10Weak modules and logarithmic intertwining operators for vertex operator algebrastext