This book constitutes the proceedings of the 11th International Symposium on Frontiers of
Combining Systems FroCoS 2017 held in Brasília Bazil in September 2017. The 17 papers
presented in this volume were carefully reviewed and selected from 26 submissions. They were
organized in topical sections named: description and temporal logics decision procedures
decidability and verification SAT SMT and automated theorem proving term rewriting and
properties and combinations of logics. The paper 'Subtropical Satisfiability' is open access
under a CC BY 4.0 license via link.springer.com.