This book constitutes the refereed proceedings of the 9th International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2011, held in Aalborg, Denmark, in September 2011. The 20 revised full papers presented together with three invited talks were carefully reviewed and selected from 43 submissions. The papers are organized in topical sections on probabilistic methods, robustness, games, verification and testing, verification, hybrid systems, and applications.

This book constitutes the proceedings of the 19th International Conference on Relational and Algebraic Methods in Computer Science, RAMiCS 2021, which took place in Marseille, France, during November 2-5, 2021. The 29 papers presented in this book were carefully reviewed and selected from 35 submissions. They deal with the development and dissemination of relation algebras, Kleene algebras, and similar algebraic formalisms. Topics covered range from mathematical foundations to applications as conceptual and methodological tools in computer science and beyond.

This book constitutes the proceedings of the 18th International Conference on Relational and Algebraic Methods in Computer Science, RAMiCS 2020, which was due to be held in Palaiseau, France, in April 2020. The conference was cancelled due to the COVID-19 pandemic. The 20 full papers presented together with 3 invited abstracts were carefully selected from 29 submissions. Topics covered range from mathematical foundations to applications as conceptual and methodological tools in computer science and beyond.