This book constitutes the refereed proceedings of the 13th European Conference on Logics in Artificial Intelligence, held in Toulouse, France, in September 2012. The book includes 3 invited talks, 36 regular papers, and 5 system descriptions, selected from 107 submissions. The papers cover various aspects of theory and methods of logic for artificial intelligence.

Intensional logics provide a comprehensive theoretical basis for establishing the foundations of programming. This volume offers seminal work on the use of intensional logics for the semantic analysis of logic programs, and programming in intensional logics. For example, modal logic, temporal logic, and linear logic prove to be very useful for these purposes. The work presented here thus yields a better understanding of logic programs and will have a significant impact on future developments of logic programming languages. The book will interest computer science graduate students and researchers, particularly those concerned with artificial intelligence, knowledge representation, logic programming, expert systems, reasoning, and natural languages.

Understanding the role of deduction in human reasoning has been an important activity in philosophy, logic, and more recetnly artificial intelligence. The basic patter of this kind of reasoning can be represented by conditional expressions of the form `if...then.' There are various kinds of conditionals that fit into this pattern, such as counterfactual conditionals (`if it were the case that A then it would be the case that B'), causal conditionals (`if A then causally B'), action conditionals (`if A then B is obtained'), conditional obligations (`if A then B should be brought about'), generic conditionals (`if A then normally B')etc. The common pattern to all these constructions is their conditional form which connects the antecedetn to the consequent in such a way that the antecedent represents a condition (or a context) for the consequent. The general question arises: is it possible to give a formal logical account of these constructions? This question is considered in this volume by a group of internationally recognized pure and applied logicians and computer scientists. Their papers reflect all the current research in this subject, and should serve as a guide for future development.