29 Feb arity

Arity is used in relational databases and logical propositions to describe the number of arguments a function or relation is expected to possess. Relational database arities are one-to-one, one-to-many, many-to-many and variations that include the possibility of none. Functional arities are the number of arguments or relations needed to form a complete proposition or function.

See: http://logic.stanford.edu/dataintegration/chapters/chap02.html
Keywords: relation
function
form
argument
References: algorithms
automata
computing
formalisms
logic
rules
syntax