, Volume 78, Issue 2, pp 141–166 | Cite as

Why the Principle of the Identity of Indiscernibles is not contingently true either

  • Steven French


Faced with strong arguments to the effect that Leibniz'sPrinciple of the Identity of Indiscernibles (PII) is not a necessary truth, many supporters of the Principle have staged a strategic retreat to the claim that it is contingently true in this, the actual, world. The purpose of this paper is to examine the status of the various forms of PII in both classical and quantum physics, and it is concluded that this latter view is at best doubtful, at worst, simply wrong.


Strong Argument Strategic Retreat 
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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Steven French
    • 1
  1. 1.Centro de Lógica, Epistemologia e História de CiênciaUniversidade Estadual de CampinasBrazil

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