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date: 24 August 2019

Abstract and Keywords

This chapter discusses three fundamental principles of Leibniz's philosophy: the Principle of Contradiction, the Principle of Sufficient Reason, and the Principle of Identity of Indiscernibles. It evaluates various formulations of these principles, their axiomatic character, and some attempts to demonstrate them. In particular, the chapter discusses in detail the derivation of the Principle of Sufficient Reason in Primary Truths, and argues that Leibniz does not use the Principle of Contradiction in that derivation. It also discusses an attempt, in the correspondence with Clarke, to prove the Principle of Sufficient Reason empirically. Finally, the article examines the argument for the Principle of Identity of Indiscernibles in the Discourse on Metaphysics.

Keywords: Leibniz, Principle of Contradiction, Principle of Sufficient Reason, Principle of Identity of Indiscernibles

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