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内容説明 This volume contains the refereed proceedings of the 11th International Conference on Logic Programming and Nonmonotonic Reasoning， LPNMR 2011， held in May 2011 in Vancouver， Canada. The 16 revised full papers (13 technical papers， 1 application description， and 2 system descriptions) and 26 short papers (16 technical papers， 3 application description， and 7 system descriptions) which were carefully reviewed and selected from numerous submissions， are presented together with 3 invited talks. Being a forum for exchanging ideas on declarative logic programming， nonmonotonic reasoning， and knowledge representation， the conference aims to facilitate interactions between those researchers and practitioners interested in the design and implementation of logic-based programming languages and database systems， and those who work in the area of knowledge representation and nonmonotonic reasoning.