This book constitutes the refereed proceedings of the 9th International Symposium on Frontiers of Combining Systems, FroCoS 2013, held in Nancy, France, in September 2013. The 20 revised full papers presented together with 4 invited papers were carefully reviewed and selected from 33 submissions. FroCoS'13 seeks to offer a common forum for research in the general area of combination, modularization and integration of systems, with emphasis on logic-based ones, and of their practical use. Typical topics of interest include following subjects: combinations of logics such as combined predicate, temporal, modal or epistemic logics, combinations and modularity in ontologies, combination of decision, procedures, of satisfiability, procedures and of constraint solving techniques, combinations and modularity in term rewriting, integration of equational and other theories into deductive systems, combination of deduction systems and computer algebra, integration of data structures into constraint logic programming and deduction, and modularizing programs and specifications.

This book constitutes the refereed proceedings of the 9th International Conference on Algebraic Methodology and Software Technology, AMAST 2002, held in Saint-Gilles-les-Bains, Reunion Island, France in September 2002.The 26 revised full papers presented together with 6 invited papers and 2 system descriptions were carefully reviewed and selected from 59 submissions. Among the topics covered are all current issues in formal methods related to algebraic approaches including abstract data types, process algebras, algebraic specification, semantic specification, model checking, mu-calculus, Petri box algebras, unification, verification of Java for smart cards, security, JML specification, and formal software development.

This volume contains the proceedings of FroCoS2000, the 3rd International WorkshoponFrontiersofCombiningSystems, heldMarch22-24,2000, inNancy, France. Like its predecessors organized in Munich (1996) and in Amsterdam (1998), FroCoS2000 is intended to o?er a common forum for research activities related to the combination and the integration of systems in the areas of logic, automateddeduction, constraintsolving, declarativeprogramming, andarti?cial intelligence. There were 31 submissions of overall high quality, authored by researchers from countries including Australia, Brasil, Belgium, Chili, France, Germany, - pan, Ireland, Italy, Portugal, Spain, Switzerland, The Netherlands, the United Kingdom, and the United States of America. All submissions were thoroughly evaluatedonthebasisofatleastthreerefereereports, andanelectronicprogram committeemeetingwasheldthroughtheInternet.Theprogramcommitteesel- ted 14 research contributions. The topics covered by the selected papers include: combinationoflogics;combinationofconstraintsolvingtechniques, combination of decision procedures; modular properties for theorem proving; combination of deduction systems and computer algebra; integration of decision procedures and other solving processes into constraint programming and deduction systems. We welcomed ?ve invited lectures by Alexander Bockmayr on "Combining Logic and Optimization in Cutting Plane Theory," Gilles Dowek on "Axioms vs. Rewrite Rules: From Completeness to Cut Elimination," Klaus Schulz on "Why Combined Decision Problems Are Often Intractable," Tomas Uribe on "Combinations of Theorem Proving and Model Checking," and Richard Zippel on "Program Composition Techniques for Numerical PDE Codes." Full papers of these lectures, except the last one, are also included in this volume.