@misc{Lexicon of Arguments, title = {Quotation from: Lexicon of Arguments – Concepts - Ed. Martin Schulz, 29 Mar 2024}, author = {Cresswell,Maxwell J.}, subject = {Leibniz Principle}, note = {I 127 Leibniz Principle/Identity/Cresswell: a) metaphysical (uncontroversial): indistinguishability b) linguistically: substitutability. >Indistinguishability, >Substitution. Problem: in the context of reference: are descriptions real qualifying words? >Reference, >Descriptions, >Designation. Indefinite description: no one believes that it is referring. Exception: Epsilon Operator/Hilbert: εxF (x): "an x such that F (x)". Indefinite description: here the Leibniz-Principle does not apply. ((s) Explanation: Example mathematics: √4: +2 or -2. These are not indistinguishable).}, note = { Cr I M. J. Cresswell Semantical Essays (Possible worlds and their rivals) Dordrecht Boston 1988 Cr II M. J. Cresswell Structured Meanings Cambridge Mass. 1984 }, file = {http://philosophy-science-humanities-controversies.com/listview-details.php?id=243329} url = {http://philosophy-science-humanities-controversies.com/listview-details.php?id=243329} }