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Ideas for 'fragments/reports', 'Events' and 'Letters to Samuel Masson'

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6. Mathematics / A. Nature of Mathematics / 5. The Infinite / d. Actual infinite

13190	I don't admit infinite numbers, and consider infinitesimals to be useful fictions [Leibniz]
	Full Idea: Notwithstanding my infinitesimal calculus, I do not admit any real infinite numbers, even though I confess that the multitude of things surpasses any finite number, or rather any number. ..I consider infinitesimal quantities to be useful fictions.
	From: Gottfried Leibniz (Letters to Samuel Masson [1716], 1716)
	A reaction: With the phrase 'useful fictions' we seem to have jumped straight into Harty Field. I'm with Leibniz on this one. The history of mathematics is a series of ingenious inventions, whenever they seem to make further exciting proofs possible.