1、 The number of arguments to a function is called it's arity,and is used to help identify the functions.
函数的参数数量称为元数(arity)，用于帮助标识函数。
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2、 In a finite universe of discourse, one can represent the assignments of predicates with arity n by n-dimensional arrays.
在有穷论域下，可以用n维数组来表示对n元谓词的赋值。
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