This open access book constitutes the proceedings of the 23rd International Conference on
Foundations of Software Science and Computational Structures FOSSACS 2020 which took place in
Dublin Ireland in April 2020 and was held as Part of the European Joint Conferences on
Theory and Practice of Software ETAPS 2020.The 31 regular papers presented in this volume were
carefully reviewed and selected from 98 submissions.The papers cover topics such as categorical
models and logics language theory automata and games modal spatial and temporal logics
type theory and proof theory concurrency theory and process calculi rewriting theory
semantics of programming languages program analysis correctness transformation and
verification logics of programming software specification and refinement models of
concurrent reactive stochastic distributed hybrid and mobile systems emerging models of
computation logical aspects of computational complexity models of software security and
logical foundations of data bases.
