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Galilei, Galileo (1564 - 1642)

And who can doubt that it will lead to the worst disorders when minds created free by God are compelled to submit slavishly to an outside will? When we are told to deny our senses and subject them to the whim of others? When people devoid of whatsoever competence are made judges over experts and are granted authority to treat them as they please? These are the novelties which are apt to bring about the ruin of commonwealths and the subversion of the state.
[On the margin of his own copy of Dialogue on the Great World Systems].

In J. R. Newman (ed.) The World of Mathematics, New York: Simon and Schuster, 1956, p. 733.

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Loci: Loci: Convergence

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Important events from the history of math that happened on this day:

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December 15th

1742 Euler gives the first clear statement of the fundamental theorem of algebra; every algebraic equation of degree n has exactly n complex roots. Imprecise statements of the result were given earlier by Peter Rothe (1608) and Albert Girard (1629). Incorrect proofs were given by d'Alembert (1746), Euler (1749), Foncenex (1759), Lagrange (1772) and Laplace (1795), but a correct proof (and the name) had to await Gauss's doctoral dissertation of 1799, who discovered it in the fall of 1797 when he was 20.

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Leonhard Euler
Carl Friedrich Gauss
The Fundemental Theorem of Algebra
1802 Janos Bolyai born in Kolozsvar, Hungary (now Cluj, Romania.

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Janos Bolyai
1887 Nature quotes J.J. Sylvester; "Perhaps I may, without immodesty, lay claim to the appelation of the mathematical Adam, as I believe I have given more names (passed into general circulation) to the creatures of the mathematical reason than all other mathematicians of the age combined."

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James Joseph Sylvester

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