Edited in collaboration with FoLLI the Association of Logic Language and Information this
book constitutes the refereed proceedings of the 20th Workshop on Logic Language Information
and Communication WoLLIC 2013 held in Darmstadt Germany in August 2013. The 17 contributed
papers presented together with 6 invited lectures were carefully reviewed and selected from 30
submissions. The scope of the workshop spans the theoretical and practical aspects of formal
logic computing and programming theory and natural language and reasoning.
