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Freeman Dyson

The difference between a text without problems and a text with problems is like the difference between learning to read a language and learning to speak it.

Disturbing the Universe

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November 24th

1639 Transit of Venus first observed by Jeremiah Horrocks, who described it in Venus in Sole Visa.

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Jeremiah Horrocks
Horrocks' Account of the 1639 Transit
1759 Lagrange wrote Euler that he believed that he had developed the true metaphysics of the calculus; at that time he seems to have been convinced that the use of infinitesimals was rigorous. Lagrange attempted to prove Taylor's Theorem, the power of which he was the first to observe, and then to develop the entire calculus from it.

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Joseph-Louis Lagrange
Leonhard Euler
Taylor's Theorem
1858 Dedekind discovered his cuts, representing real numbers in terms of rationals, and thereby provided the first correct definition of continuity.

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Richard Dedekind

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