1012.4196 (Yi-Zhi Huang et al.)

Logarithmic tensor category theory, II: Logarithmic formal calculus and
properties of logarithmic intertwining operators    [PDF]

Yi-Zhi Huang, James Lepowsky, Lin Zhang

This is the second part in a series of papers in which we introduce and develop a natural, general tensor category theory for suitable module categories for a vertex (operator) algebra. In this paper (Part II), we develop logarithmic formal calculus and study logarithmic intertwining operators.

View original: http://arxiv.org/abs/1012.4196