Leibnizian models of set theory

Publisher: Cambridge University Press

E-ISSN: 1943-5886|69|3|775-789

ISSN: 0022-4812

Source: The Journal of Symbolic Logic, Vol.69, Iss.3, 2004-09, pp. : 775-789

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Abstract

A model is said to be Leibnizian if it has no pair of indiscernibles. Mycielski has shown that there is a first order axiom LM (the Leibniz-Mycielski axiom) such that for any completion T of Zermelo-Fraenkel set theory ZF. T has a Leibnizian model if and only if T proves LM. Here we prove: