
Definition of Binary function
1. Noun. (mathematics) a function of the type $f:\; V\; \backslash times\; V\; \backslash rightarrow\; V$, or more generally, a function of the type $f\; :\; U\_1\; \backslash times\; U\_2\; \backslash times\; ...\; \backslash times\; U\_n\; \backslash rightarrow\; V$ in which exactly two of the sets ''U_{i}'' are equal to ''V''. ¹
¹ Source: wiktionary.com
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