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Fitch notation

Fitch notation, also known as Fitch diagrams (named after Frederic Fitch), is a method of presenting natural deduction proofs in propositional calculus and first-order logics using a structured, line-by-line format that explicitly shows assumptions, inferences, and their scope. It was invented by Frederic Brenton Fitch in the 1930s and later popularized…

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History

Princeton UniversityAlonzo ChurchPatrick SuppesE. J. LemmonSuppes–Lemmon format
5 related topics

Structure

Rule of inferenceTautologyReductio ad absurdum
3 related topics

Influence

LogicProof assistant
2 related topics

Comparison with Other Systems

Hilbert system
1 related topics

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Overview

History

Structure

Comparison with Other Systems

Influence

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Map overview Semantic statistics

Fitch notation

Nodes21
Edges20
Triples45
Avg. degree1.9
Density0.095238
Components1

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Fitch notation

Top relations

related to External links · 29
Fitch notation → An, Archived, Berit, Brogaard, Edward, Fall, Fitch, Fitch's Paradox, FitchJS, GitHub, In Zalta, ISSN, Jape, Java, Joe, Knowability, LaTeX, Logic Matters, May, Natural
related to Comparison with Other Systems · 9
Fitch notation → Fitch's, Gentzen, Gentzen-style, Hilbert, Instead, Lemmon, The Suppes, This, Unlike Fitch
related to Influence · 3
Fitch notation → Fitch, It, Its
related to Structure · 2
Fitch notation → Fitch, Optionally

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Important terminology

logic fitch notation proof assumptions proofs natural deduction system retrieved may 2025 indentation scope suppes lemmon frederic also systems fitch's

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Patrick Suppesinstance ofwhich was used extensively in undergraduate instruction.Later logicians and educators0.80text
Einstance ofwhich was used extensively in undergraduate instruction.Later logicians and educators0.80text
Fitch notationrelated to Comparison with Other SystemsGentzen-style0.60section
Fitch notationrelated to Comparison with Other SystemsUnlike Fitch0.60section
Fitch notationrelated to Comparison with Other SystemsInstead0.60section
Fitch notationrelated to Comparison with Other SystemsThis0.60section
Fitch notationrelated to Comparison with Other SystemsGentzen0.60section
Fitch notationrelated to Comparison with Other SystemsHilbert0.60section
Fitch notationrelated to Comparison with Other SystemsThe Suppes0.60section
Fitch notationrelated to Comparison with Other SystemsLemmon0.60section
Fitch notationrelated to Comparison with Other SystemsFitch's0.60section
Fitch notationrelated to External linksBrogaard0.60section

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