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Curry–Howard correspondence

Index Curry–Howard correspondence

In programming language theory and proof theory, the Curry–Howard correspondence (also known as the Curry–Howard isomorphism or equivalence, or the proofs-as-programs and propositions- or formulae-as-types interpretation) is the direct relationship between computer programs and mathematical proofs. [1]

122 relations: Abstract machine, Academic Press, Algebraic data type, Analogy, Andrey Kolmogorov, Apply, Arend Heyting, Automath, Axiom of choice, Axiom schema, Bottom type, Brouwer–Heyting–Kolmogorov interpretation, Calculus of constructions, Calculus of structures, Call-with-current-continuation, Cartesian closed category, Categorical logic, Category theory, Classical logic, Closed monoidal category, Cobordism, Combinatory logic, Computer program, Conditional proof, Continuation, Continuation-passing style, Coq, Corecursion, Correctness (computer science), Currying, Dag Prawitz, Data type, Deduction theorem, Dependent type, Dialectica interpretation, Double-negation translation, Elsevier, Evaluation strategy, Existential quantification, Formal system, Function type, Functional programming, Genetic programming, Georg Kreisel, Gerhard Gentzen, Grothendieck topology, Haskell Curry, Higher-order logic, Hilbert system, Homotopy, ..., Homotopy type theory, Hypothesis, Initial and terminal objects, Institute for Advanced Study, Intuitionism, Intuitionistic logic, Intuitionistic type theory, Joachim Lambek, Kurt Gödel, L. E. J. Brouwer, Lambda calculus, Lambda-mu calculus, Linear logic, Logic, Logic for Programming, Artificial Intelligence and Reasoning, Logic programming, Logical conjunction, Logical consequence, Logical disjunction, Mathematical induction, Mathematical proof, Mathematician, Modal logic, Model of computation, Modus ponens, Monad (functional programming), Natural deduction, Nicolaas Govert de Bruijn, Normalization property (abstract rewriting), Oxford University Press, Peirce's law, Per Martin-Löf, Peter Johnstone (mathematician), Principal type, Product type, Programming language, Programming language theory, Proof calculus, Proof net, Proof theory, Proof-carrying code, Realizability, Recursion (computer science), Relevance logic, Return type, Rule of inference, Sequent, Sequent calculus, Set theory, Simply typed lambda calculus, Springer Science+Business Media, Stephen Cole Kleene, String theory, Substructural type system, System F, Tagged union, Tautology (logic), Thierry Coquand, Total functional programming, Turing completeness, Turing machine, Type inhabitation, Type rule, Type system, Type theory, Typed assembly language, Typed lambda calculus, Unifying theories in mathematics, Unit type, Universal quantification, Well-formed formula, William Alvin Howard. Expand index (72 more) »

Abstract machine

An abstract machine, also called an abstract computer, is a theoretical model of a computer hardware or software system used in automata theory.

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Academic Press

Academic Press is an academic book publisher.

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Algebraic data type

In computer programming, especially functional programming and type theory, an algebraic data type is a kind of composite type, i.e., a type formed by combining other types.

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Analogy

Analogy (from Greek ἀναλογία, analogia, "proportion", from ana- "upon, according to" + logos "ratio") is a cognitive process of transferring information or meaning from a particular subject (the analog, or source) to another (the target), or a linguistic expression corresponding to such a process.

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Andrey Kolmogorov

Andrey Nikolaevich Kolmogorov (a, 25 April 1903 – 20 October 1987) was a 20th-century Soviet mathematician who made significant contributions to the mathematics of probability theory, topology, intuitionistic logic, turbulence, classical mechanics, algorithmic information theory and computational complexity.

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Apply

In mathematics and computer science, apply is a function that applies functions to arguments.

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Arend Heyting

__notoc__ Arend Heyting (9 May 1898 – 9 July 1980) was a Dutch mathematician and logician.

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Automath

Automath ("automating mathematics") was a formal language, devised by Nicolaas Govert de Bruijn starting in 1967, for expressing complete mathematical theories in such a way that an included automated proof checker can verify their correctness.

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Axiom of choice

In mathematics, the axiom of choice, or AC, is an axiom of set theory equivalent to the statement that the Cartesian product of a collection of non-empty sets is non-empty.

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Axiom schema

In mathematical logic, an axiom schema (plural: axiom schemata or axiom schemas) generalizes the notion of axiom.

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Bottom type

In type theory, a theory within mathematical logic, the bottom type is the type that has no values.

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Brouwer–Heyting–Kolmogorov interpretation

In mathematical logic, the Brouwer–Heyting–Kolmogorov interpretation, or BHK interpretation, of intuitionistic logic was proposed by L. E. J. Brouwer and Arend Heyting, and independently by Andrey Kolmogorov.

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Calculus of constructions

In mathematical logic and computer science, the calculus of constructions (CoC) is a type theory created by Thierry Coquand.

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Calculus of structures

The calculus of structures is a proof calculus with deep inference for studying the structural proof theory of noncommutative logic.

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Call-with-current-continuation

In Scheme programming, the function call-with-current-continuation, abbreviated call/cc, is used as a control operator.

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Cartesian closed category

In category theory, a category is considered Cartesian closed if, roughly speaking, any morphism defined on a product of two objects can be naturally identified with a morphism defined on one of the factors.

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Categorical logic

Categorical logic is the branch of mathematics in which tools and concepts from category theory are applied to the study of mathematical logic.

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Category theory

Category theory formalizes mathematical structure and its concepts in terms of a labeled directed graph called a category, whose nodes are called objects, and whose labelled directed edges are called arrows (or morphisms).

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Classical logic

Classical logic (or standard logic) is an intensively studied and widely used class of formal logics.

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Closed monoidal category

In mathematics, especially in category theory, a closed monoidal category (or a monoidal closed category) is a category which is both a monoidal category and a closed category in such a way that the structures are compatible.

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Cobordism

In mathematics, cobordism is a fundamental equivalence relation on the class of compact manifolds of the same dimension, set up using the concept of the boundary (French bord, giving cobordism) of a manifold.

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Combinatory logic

Combinatory logic is a notation to eliminate the need for quantified variables in mathematical logic.

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Computer program

A computer program is a collection of instructions for performing a specific task that is designed to solve a specific class of problems.

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Conditional proof

A conditional proof is a proof that takes the form of asserting a conditional, and proving that the antecedent of the conditional necessarily leads to the consequent.

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Continuation

In computer science and computer programming, a continuation is an abstract representation of the control state of a computer program.

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Continuation-passing style

In functional programming, continuation-passing style (CPS) is a style of programming in which control is passed explicitly in the form of a continuation.

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Coq

In computer science, Coq is an interactive theorem prover.

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Corecursion

In computer science, corecursion is a type of operation that is dual to recursion.

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Correctness (computer science)

In theoretical computer science, correctness of an algorithm is asserted when it is said that the algorithm is correct with respect to a specification.

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Currying

In mathematics and computer science, currying is the technique of translating the evaluation of a function that takes multiple arguments (or a tuple of arguments) into evaluating a sequence of functions, each with a single argument.

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Dag Prawitz

Dag Prawitz (born 1936, Stockholm) is a Swedish philosopher and logician.

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Data type

In computer science and computer programming, a data type or simply type is a classification of data which tells the compiler or interpreter how the programmer intends to use the data.

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Deduction theorem

In mathematical logic, the deduction theorem is a metatheorem of propositional and first-order logic.

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Dependent type

In computer science and logic, a dependent type is a type whose definition depends on a value.

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Dialectica interpretation

In proof theory, the Dialectica interpretation is a proof interpretation of intuitionistic arithmetic (Heyting arithmetic) into a finite type extension of primitive recursive arithmetic, the so-called System T. It was developed by Kurt Gödel to provide a consistency proof of arithmetic.

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Double-negation translation

In proof theory, a discipline within mathematical logic, double-negation translation, sometimes called negative translation, is a general approach for embedding classical logic into intuitionistic logic, typically by translating formulas to formulas which are classically equivalent but intuitionistically inequivalent.

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Elsevier

Elsevier is an information and analytics company and one of the world's major providers of scientific, technical, and medical information.

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Evaluation strategy

Evaluation strategies are used by programming languages to determine when to evaluate the argument(s) of a function call (for function, also read: operation, method, or relation) and what kind of value to pass to the function.

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Existential quantification

In predicate logic, an existential quantification is a type of quantifier, a logical constant which is interpreted as "there exists", "there is at least one", or "for some".

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Formal system

A formal system is the name of a logic system usually defined in the mathematical way.

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Function type

In computer science, a function type (or arrow type or exponential) is the type of a variable or parameter to which a function has or can be assigned, or an argument or result type of a higher-order function taking or returning a function.

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Functional programming

In computer science, functional programming is a programming paradigm—a style of building the structure and elements of computer programs—that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data.

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Genetic programming

In artificial intelligence, genetic programming (GP) is a technique whereby computer programs are encoded as a set of genes that are then modified (evolved) using an evolutionary algorithm (often a genetic algorithm, "GA") – it is an application of (for example) genetic algorithms where the space of solutions consists of computer programs.

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Georg Kreisel

Georg Kreisel FRS (September 15, 1923 – March 1, 2015) was an Austrian-born mathematical logician who studied and worked in Great Britain and America.

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Gerhard Gentzen

Gerhard Karl Erich Gentzen (November 24, 1909 – August 4, 1945) was a German mathematician and logician.

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Grothendieck topology

In category theory, a branch of mathematics, a Grothendieck topology is a structure on a category C which makes the objects of C act like the open sets of a topological space.

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Haskell Curry

Haskell Brooks Curry (September 12, 1900 – September 1, 1982) was an American mathematician and logician.

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Higher-order logic

In mathematics and logic, a higher-order logic is a form of predicate logic that is distinguished from first-order logic by additional quantifiers and, sometimes, stronger semantics.

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Hilbert system

In logic, especially mathematical logic, a Hilbert system, sometimes called Hilbert calculus, Hilbert-style deductive system or Hilbert–Ackermann system, is a type of system of formal deduction attributed to Gottlob FregeMáté & Ruzsa 1997:129 and David Hilbert.

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Homotopy

In topology, two continuous functions from one topological space to another are called homotopic (from Greek ὁμός homós "same, similar" and τόπος tópos "place") if one can be "continuously deformed" into the other, such a deformation being called a homotopy between the two functions.

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Homotopy type theory

In mathematical logic and computer science, homotopy type theory (HoTT) refers to various lines of development of intensional type theory, based on the interpretation of types as objects to which the intuition of (abstract) homotopy theory applies.

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Hypothesis

A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon.

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Initial and terminal objects

In category theory, a branch of mathematics, an initial object of a category C is an object I in C such that for every object X in C, there exists precisely one morphism I → X. The dual notion is that of a terminal object (also called terminal element): T is terminal if for every object X in C there exists a single morphism X → T. Initial objects are also called coterminal or universal, and terminal objects are also called final.

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Institute for Advanced Study

The Institute for Advanced Study (IAS) in Princeton, New Jersey, in the United States, is an independent, postdoctoral research center for theoretical research and intellectual inquiry founded in 1930 by American educator Abraham Flexner, together with philanthropists Louis Bamberger and Caroline Bamberger Fuld.

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Intuitionism

In the philosophy of mathematics, intuitionism, or neointuitionism (opposed to preintuitionism), is an approach where mathematics is considered to be purely the result of the constructive mental activity of humans rather than the discovery of fundamental principles claimed to exist in an objective reality.

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Intuitionistic logic

Intuitionistic logic, sometimes more generally called constructive logic, refers to systems of symbolic logic that differ from the systems used for classical logic by more closely mirroring the notion of constructive proof.

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Intuitionistic type theory

Intuitionistic type theory (also known as constructive type theory, or Martin-Löf type theory) is a type theory and an alternative foundation of mathematics.

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Joachim Lambek

Joachim "Jim" Lambek (5 December 1922 – 23 June 2014) was Peter Redpath Emeritus Professor of Pure Mathematics at McGill University, where he earned his Ph.D. degree in 1950 with Hans Zassenhaus as advisor.

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Kurt Gödel

Kurt Friedrich Gödel (April 28, 1906 – January 14, 1978) was an Austrian, and later American, logician, mathematician, and philosopher.

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L. E. J. Brouwer

Luitzen Egbertus Jan Brouwer (27 February 1881 – 2 December 1966), usually cited as L. E. J. Brouwer but known to his friends as Bertus, was a Dutch mathematician and philosopher, who worked in topology, set theory, measure theory and complex analysis.

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Lambda calculus

Lambda calculus (also written as λ-calculus) is a formal system in mathematical logic for expressing computation based on function abstraction and application using variable binding and substitution.

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Lambda-mu calculus

In mathematical logic and computer science, the lambda-mu calculus is an extension of the lambda calculus introduced by M. Parigot.

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Linear logic

Linear logic is a substructural logic proposed by Jean-Yves Girard as a refinement of classical and intuitionistic logic, joining the dualities of the former with many of the constructive properties of the latter.

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Logic

Logic (from the logikḗ), originally meaning "the word" or "what is spoken", but coming to mean "thought" or "reason", is a subject concerned with the most general laws of truth, and is now generally held to consist of the systematic study of the form of valid inference.

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Logic for Programming, Artificial Intelligence and Reasoning

The International Conference on Logic for Programming, Artificial Intelligence and Reasoning (LPAR) is an academic conference aiming at discussing cutting-edge results in the fields of automated reasoning, computational logic, programming languages and their applications.

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Logic programming

Logic programming is a type of programming paradigm which is largely based on formal logic.

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Logical conjunction

In logic, mathematics and linguistics, And (∧) is the truth-functional operator of logical conjunction; the and of a set of operands is true if and only if all of its operands are true.

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Logical consequence

Logical consequence (also entailment) is a fundamental concept in logic, which describes the relationship between statements that hold true when one statement logically follows from one or more statements.

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Logical disjunction

In logic and mathematics, or is the truth-functional operator of (inclusive) disjunction, also known as alternation; the or of a set of operands is true if and only if one or more of its operands is true.

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Mathematical induction

Mathematical induction is a mathematical proof technique.

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Mathematical proof

In mathematics, a proof is an inferential argument for a mathematical statement.

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Mathematician

A mathematician is someone who uses an extensive knowledge of mathematics in his or her work, typically to solve mathematical problems.

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Modal logic

Modal logic is a type of formal logic primarily developed in the 1960s that extends classical propositional and predicate logic to include operators expressing modality.

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Model of computation

In computer science, and more specifically in computability theory and computational complexity theory, a model of computation is a model which describes how a set of outputs are computed given a set of inputs.

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Modus ponens

In propositional logic, modus ponens (MP; also modus ponendo ponens (Latin for "mode that affirms by affirming") or implication elimination) is a rule of inference.

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Monad (functional programming)

In functional programming, a monad is a design pattern that defines how functions, actions, inputs, and outputs can be used together to build generic types, with the following organization.

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Natural deduction

In logic and proof theory, natural deduction is a kind of proof calculus in which logical reasoning is expressed by inference rules closely related to the "natural" way of reasoning.

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Nicolaas Govert de Bruijn

Nicolaas Govert (Dick) de Bruijn (9 July 1918 – 17 February 2012) was a Dutch mathematician, noted for his many contributions in the fields of analysis, number theory, combinatorics and logic.

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Normalization property (abstract rewriting)

In mathematical logic and theoretical computer science, a rewrite system has the (strong) normalization property or is terminating if every term is strongly normalizing; that is, if every sequence of rewrites eventually terminates with an irreducible term, also called a normal form.

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Oxford University Press

Oxford University Press (OUP) is the largest university press in the world, and the second oldest after Cambridge University Press.

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Peirce's law

In logic, Peirce's law is named after the philosopher and logician Charles Sanders Peirce.

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Per Martin-Löf

Per Erik Rutger Martin-Löf (born May 8, 1942) is a Swedish logician, philosopher, and mathematical statistician.

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Peter Johnstone (mathematician)

Peter Tennant Johnstone (born 1948) is Professor of the Foundations of Mathematics at the University of Cambridge, and a fellow of St. John's College.

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Principal type

In type theory, a type system is said to have the principal type property if, given a term and an environment, there exists a principal type for this term in this environment, i.e. a type such that all other types for this term in this environment are an instance of the principal type.

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Product type

In programming languages and type theory, a product of types is another, compounded, type in a structure.

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Programming language

A programming language is a formal language that specifies a set of instructions that can be used to produce various kinds of output.

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Programming language theory

Programming language theory (PLT) is a branch of computer science that deals with the design, implementation, analysis, characterization, and classification of programming languages and their individual features.

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Proof calculus

In mathematical logic, a proof calculus or a proof system is built to prove statements.

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Proof net

In proof theory, proof nets are a geometrical method of representing proofs that eliminates two forms of bureaucracy that differentiates proofs: (A) irrelevant syntactical features of regular proof calculi such as the natural deduction calculus and the sequent calculus, and (B) the order of rules applied in a derivation.

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Proof theory

Proof theory is a major branchAccording to Wang (1981), pp.

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Proof-carrying code

Proof-carrying code (PCC) is a software mechanism that allows a host system to verify properties about an application via a formal proof that accompanies the application's executable code.

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Realizability

In mathematical logic, realizability is a collection of methods in proof theory used to study constructive proofs and extract additional information from them.

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Recursion (computer science)

Recursion in computer science is a method of solving a problem where the solution depends on solutions to smaller instances of the same problem (as opposed to iteration).

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Relevance logic

Relevance logic, also called relevant logic, is a kind of non-classical logic requiring the antecedent and consequent of implications to be relevantly related.

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Return type

In computer programming, the return type (or result type) defines and constrains the data type of the value returned from a subroutine or method.

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Rule of inference

In logic, a rule of inference, inference rule or transformation rule is a logical form consisting of a function which takes premises, analyzes their syntax, and returns a conclusion (or conclusions).

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Sequent

In mathematical logic, a sequent is a very general kind of conditional assertion.

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Sequent calculus

Sequent calculus is, in essence, a style of formal logical argumentation where every line of a proof is a conditional tautology (called a sequent by Gerhard Gentzen) instead of an unconditional tautology.

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Set theory

Set theory is a branch of mathematical logic that studies sets, which informally are collections of objects.

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Simply typed lambda calculus

The simply typed lambda calculus (\lambda^\to), a form of type theory, is a typed interpretation of the lambda calculus with only one type constructor: \to that builds function types.

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Springer Science+Business Media

Springer Science+Business Media or Springer, part of Springer Nature since 2015, is a global publishing company that publishes books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing.

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Stephen Cole Kleene

Stephen Cole Kleene (January 5, 1909 – January 25, 1994) was an American mathematician.

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String theory

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings.

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Substructural type system

Substructural type systems are a family of type systems analogous to substructural logics where one or more of the structural rules are absent or only allowed under controlled circumstances.

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System F

System F, also known as the (Girard–Reynolds) polymorphic lambda calculus or the second-order lambda calculus, is a typed lambda calculus that differs from the simply typed lambda calculus by the introduction of a mechanism of universal quantification over types.

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Tagged union

In computer science, a tagged union, also called a variant, variant record, choice type, discriminated union, disjoint union, or sum type, is a data structure used to hold a value that could take on several different, but fixed, types.

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Tautology (logic)

In logic, a tautology (from the Greek word ταυτολογία) is a formula or assertion that is true in every possible interpretation.

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Thierry Coquand

Thierry Coquand (born 18 April 1961 in Jallieu, Isère, France) is a professor in computer science at the University of Gothenburg, Sweden.

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Total functional programming

Total functional programming (also known as strong functional programming, to be contrasted with ordinary, or weak functional programming) is a programming paradigm that restricts the range of programs to those that are provably terminating.

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Turing completeness

In computability theory, a system of data-manipulation rules (such as a computer's instruction set, a programming language, or a cellular automaton) is said to be Turing complete or computationally universal if it can be used to simulate any Turing machine.

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Turing machine

A Turing machine is a mathematical model of computation that defines an abstract machine, which manipulates symbols on a strip of tape according to a table of rules.

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Type inhabitation

In type theory, a branch of mathematical logic, in a given typed calculus, the type inhabitation problem for this calculus is the following problem: given a type \tau and a typing environment \Gamma, does there exist a \lambda-term M such that \Gamma \vdash M: \tau? With an empty type environment, such an M is said to be an inhabitant of \tau.

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Type rule

In type theory, a type rule is an inference rule that describes how a type system assigns a type to a syntactic construction.

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Type system

In programming languages, a type system is a set of rules that assigns a property called type to the various constructs of a computer program, such as variables, expressions, functions or modules.

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Type theory

In mathematics, logic, and computer science, a type theory is any of a class of formal systems, some of which can serve as alternatives to set theory as a foundation for all mathematics.

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Typed assembly language

In computer science, a typed assembly language (TAL) is an assembly language that is extended to include a method of annotating the datatype of each value that is manipulated by the code.

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Typed lambda calculus

A typed lambda calculus is a typed formalism that uses the lambda-symbol (\lambda) to denote anonymous function abstraction.

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Unifying theories in mathematics

There have been several attempts in history to reach a unified theory of mathematics.

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Unit type

In the area of mathematical logic and computer science known as type theory, a unit type is a type that allows only one value (and thus can hold no information).

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Universal quantification

In predicate logic, a universal quantification is a type of quantifier, a logical constant which is interpreted as "given any" or "for all".

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Well-formed formula

In mathematical logic, propositional logic and predicate logic, a well-formed formula, abbreviated WFF or wff, often simply formula, is a finite sequence of symbols from a given alphabet that is part of a formal language.

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William Alvin Howard

William Alvin Howard (born 1926) is a proof theorist best known for his work demonstrating formal similarity between intuitionistic logic and the simply typed lambda calculus that has come to be known as the Curry–Howard correspondence.

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References

[1] https://en.wikipedia.org/wiki/Curry–Howard_correspondence

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