2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/153586We construct tensor and bitensor categories with given Grothedieck rig (fusion algebra) in simple cases. The results provide examples on which to test the conjectural construction of 4-D TQFT's proposed by Crane and Frenkel and shed light on several other constructions of TQFT's.LaTeX Sun Release 4.1, uses amssym.def and amsssymQuantum Algebra18D10text