Roberval was one of those mathematicians who, just before the invention of the infinitesimal calculus, occupied their attention with problems which are only soluble, or can be most easily solved, by some method involving limits or infinitesimals, and in the solution of which accordingly the calculus is always now employed. [Please select]
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We cannot observe infinitesimals, whether in time or space; we do not even know whether time and space are infinitely divisible. [Please select]
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These, I say, assert there are infinitesimals of infinitesimals of infinitesimals, &c. [Please select]
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Weierstrass,[13] by strictly banishing from mathematics the use of infinitesimals, has at last shown that we live in an unchanging world, and that the arrow in its flight is truly at rest. [Please select]
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