## Partial Functions July 30, 2006

From “Recursive Functions of Symbolic Expressions and Their Computation by Machine, Part I”, John McCarthy, CACM, (3)4, April 1960:

A partial function is a function that is defined only on part of its domain. Partial functions necessarily arise when functions are defined by computations because for some values of the arguments the computation defining the value of the function may not terminate.

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