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<p>A <a href="page.php?w=formal_proof">formal proof</a> is written in a <a href="page.php?w=formal_language">formal language</a> instead of natural language. A formal proof is a sequence of <a href="page.php?w=well-formed_formula">formulas</a> in a formal language, starting with an assumption, and with each subsequent formula a logical consequence of the preceding ones. This definition makes the concept of proof amenable to study. Indeed, the field of <a href="page.php?w=proof_theory">proof theory</a> studies formal proofs and their properties,</p><p>
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