Valence

Valence, a.k.a. arity or adicity, is the number of arguments a function accepts.

The minimum valence of a k function is 1 and the maximum is 8.

Applying a function to fewer arguments creates a projection. Applying it to more arguments usually causes a rank error, though some primitives may support more arguments than their nominal valence.

The following Greek and Latin-based English words are commonly used to describe a function of a particular valence:

	Greek	Latin
1	monadic	unary
2	dyadic	binary
3	triadic	ternary
4	tetradic	quaternary