Sequents and Trees

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Focusing on sequent calculi in propositional logic, this textbook emphasizes practical applications for proving various metatheoretical results. It offers a clear, self-contained presentation, combining formal and informal explanations of technical details. Readers will find numerous worked proofs, including key concepts like cut-elimination, completeness, decidability, and interpolation. Additionally, some proofs are presented as exercises, encouraging readers to engage with and practice the techniques of sequent calculus.