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Referential transparency
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=== Definiteness === A formal language is ''definite'' is defined by all the occurrences of a variable within its scope denote the same value. ''Example.'' β Mathematics is definite: : {{math|3''x''<sup>2</sup> + 2''x'' + 17}}. Indeed, the two occurrences of {{mvar|x}} denote the same value.
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