Sequents and Trees

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Focusing on sequent calculi in propositional logic, this textbook emphasizes practical applications and metatheoretical results rather than just proof theory. It presents an elementary and self-contained approach, with formal and informal explanations of technical details. Readers will find numerous worked proofs, including key results like the cut-elimination theorem and completeness. Additionally, some proofs are left as exercises, enabling readers to practice and enhance their understanding of sequent calculus techniques.