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Keywords:
isomorphic representation; extensional relation; well-founded relation; set-pro\-lon\-gation
isomorphic representation; extensional relation; well-founded relation; set-pro\-lon\-gation
Summary:
By an $\in $-representation of a relation we mean its isomorphic embedding to $\Bbb E = \{\langle x,y\rangle;\,x\in y\}$. Some theorems on such a representation are presented. Especially, we prove a version of the well-known theorem on isomorphic representation of extensional and well-founded relations in $\Bbb E$, which holds in Zermelo-Fraenkel set theory. This our version is in Zermelo-Fraenkel set theory false. A general theorem on a set-prolongation is proved; it enables us to solve the task of the representation in question.
References:
[V] Vopěnka P.: Mathematics in the Alternative Set Theory. TEUBNER TEXTE Leipzig (1979). MR 0581368
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