Robert Nieuwenhuis - Böcker

This volume contains the proceedings of the 20th International Conference on AutomatedDeduction (CADE-20).ItwasheldJuly22-27,2005inTallinn,Es- nia,togetherwiththeWorkshoponConstraintsinFormalVeri?cation(CFV'05), the Workshop on Empirically Successful Classical Automated Reasoning (ES- CAR), the Workshop on Non-Theorems, Non-Validity, Non-Provability (DIS- PROVING), and the yearly CADE ATP System Competition (CASC). CADE is the major forum for the presentation of research in all aspects of automated deduction. The ?rst CADE conference was held in 1974. Early CADEs were mostly biennial, and annual conferences started in 1996. Logics of interest include propositional, ?rst-order, equational, higher-order, classical, intuitionistic, constructive, modal, temporal, many-valued, substr- tural, description, and meta-logics, logical frameworks, type theory and set t- ory. Methods of interest include saturation, resolution, tableaux, sequent calculi, term rewriting, induction, uni?cation, constraint solving, decision procedures, model generation,model checking,natural deduction, proofplanning, proof p- sentation, proof checking, and explanation.Applications of interest include hardwareand softwaredevelopment,systems analysisandveri?cation,deductivedatabases,functionalandlogicprogramming, computer mathematics, natural language processing, computational linguistics, robotics, planning, knowledge representation, and other areas of AI. This year, there were 78 submissions, of which 9 system descriptions. Each submissionwasassignedto atleastfour programcommitteemembers,whoca- fully reviewed the papers, in many cases with the help of one or more of a total number of 115 external referees. For each submission at least four reviews were produced and forwarded to the authors. The merits of the submissions were d- cussed by the programcommittee for ten days through the Internet by means of the EasyChair system. Finally, the program committee selected for publication 25 regular research papers and 5 system descriptions.

The refereed proceedings of the 14th International Conference on Rewriting Techniques and Applications, RTA 2003, held in Valencia, Spain in June 2003. The 26 revised regular papers and 6 system descriptions presented together with 3 invited contributions were carefully reviewed and selected from 61 submissions. All current aspects of rewriting are addressed.

This book constitutes the refereed proceedings of the 8th International Conference on Logic for Programming, Artificial Intelligence, and Reasoning, LPAR 2001, held in Havana, Cuba, in December 2001. The 40 revised full papers presented together with an invited paper were carefully reviewed and selected from 112 submissions. The book offers topical sections on verification, guarded logic, agents, automated theorem proving, non-classical logics, types, experimental aspects, foundations of logic, CSP and SAT, nonmonotonic reasoning, semantics, termination, knowledge-based systems, analysis of logic programs, databases and knowledge bases, and program analysis and proof planning.