About: Arity   Sponge Permalink

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The term "arity" is primarily used with reference to functions of the form f : V → S, where V ⊂ Sn, and S is some set. Such a function is often called an operation on S, and n is its arity. Arities greater than 2 are seldom encountered in mathematics, except in specialized areas, and arities greater than 3 are seldom encountered in theoretical computer science. In computer programming there is often a syntactical distinction between operators and functions; syntactical operators usually have arity 0, 1 or 2. In mathematics, depending on the branch, arity may be called type, adicity or rank.

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  • Arity
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  • The term "arity" is primarily used with reference to functions of the form f : V → S, where V ⊂ Sn, and S is some set. Such a function is often called an operation on S, and n is its arity. Arities greater than 2 are seldom encountered in mathematics, except in specialized areas, and arities greater than 3 are seldom encountered in theoretical computer science. In computer programming there is often a syntactical distinction between operators and functions; syntactical operators usually have arity 0, 1 or 2. In mathematics, depending on the branch, arity may be called type, adicity or rank.
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  • The term "arity" is primarily used with reference to functions of the form f : V → S, where V ⊂ Sn, and S is some set. Such a function is often called an operation on S, and n is its arity. Arities greater than 2 are seldom encountered in mathematics, except in specialized areas, and arities greater than 3 are seldom encountered in theoretical computer science. In computer programming there is often a syntactical distinction between operators and functions; syntactical operators usually have arity 0, 1 or 2. In mathematics, depending on the branch, arity may be called type, adicity or rank. In computer science arity may be called adicity, a function that takes a variable number of arguments being called variadic. The term adicity (and monadic, dyadic etc.) is less ambiguous, as illustrated by the term dyadic Boolean operator where boolean can be safely replaced by binary, but replacing dyadic by binary exposes the ambiguity. In linguistics and in logic, arity is sometimes called valency, not to be confused with valency in graph theory.
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