Structural proof theory is a branch of mathematical logic and proof theory that studies the nature of proofs and their structural properties, rather than just the content of the propositions involved. It focuses on the formal systems used to derive logical conclusions and the ways in which these systems can be structured and manipulated. Key concepts in structural proof theory include: 1. **Proof Systems**: Different systems, such as natural deduction, sequent calculus, and tableaux, are analyzed to explore how proofs can be constructed and validated.
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