In metaphysics, impenetrability is the name given to that quality of matter whereby two bodies cannot occupy the same space at the same time.The philosopher John Toland argued that impenetrability and extension were sufficient to define matter, a contention strongly disputed by Gottfried Wilhelm von Leibniz.
- This article incorporates text from a publication now in the public domain: Wood, James, ed. (1907). "article name needed". The Nuttall Encyclopædia. London and New York: Frederick Warne.
- Heinemann, F. H. "Toland and Leibniz." The Philosophical Review, Vol. 54, No. 5. (Sep., 1945), pp. 437-457.
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