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Answer by Burak for Does inductive definitions must be supported by the set...
It depends on whether you wish to define a finite ordered tuple, say, a $3$-tuple $w=(x,y,z)$ at the metalanguage level or at the object language level.In the first case, saying $w=(x,y,z)$ is simply...
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In page 4 of Gödel's book The Consistency Of The Axiom Of Choice and Of The Generalized Continuum Hypothesis With The Axioms Of Set Theory, Gödel defined the $n$-tuple as$\langle x \rangle =...
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