Table of Contents

Introduction Some comments on conformal field theory Weighted pseudo limits in a 2-category Weighted pseudo colimits in the 2-category of small categories Weighted pseudo limits in the 2-category of small categories Theories and algebras Pseudo $T$-algebras Weighted pseudo limits in the 2-category of pseudo $T$-algebras Biuniversal arrows and biadjoints Forgetful 2-functors for pseudo algebras Weighted bicolomits of pseudo $T$-algebras Stacks 2-Theories, algebras, and weighted pseudo limits Bibliography Index.