What is the meaning of Arity?
The number of arguments or operands a function or operation takes. For a relation, the number of domains in the corresponding Cartesian product.
The maximum number of child nodes that any node in a given tree (data structure) may have.
the number of arguments (in Lojban grammar called sumti) specified in the definition of a selbri. (the selbri combined with the sumti make up a bridi).
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