substitution instance
名词 n.
英文释义
名词 n.
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A well-formed formula (wff) that has a constant term in place of a variable; expressed as Q(a/x), where the resulting wff is identical to Q except that the constant a takes the place of every free occurrence of the variable x.
— The result of substituting a term a for all free occurrences of the variable x in the formula Q is denoted by Q(a/x).
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数据来源: Wiktionary