High Quality Content by WIKIPEDIA articles! Fitch-style calculus (also known as Fitch diagrams) is a method for constructing formal proofs used in first-order logic. It was invented by American logician Frederic Brenton Fitch. Fitch-style proofs involve the atomic sentences of first order logic, which are arranged in premises, lemmas, and subproofs. Each step in a Fitch-style proof, except premises and subproof premises, requires a citation of a rule of first-order logic in order to justify the step. After a step is justified, then another step may be constructed upon this, until a desired conclusion has been reached.

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