# Arity

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## Definition

The arity of a function or predicate symbol is the number of parameters it takes.

## Examples

If we write [ilmath]f(x,y)[/ilmath] then [ilmath]f[/ilmath] is a 2-ary function.

## References

Grade: D
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Not important Alec (talk) 15:10, 15 December 2017 (UTC)