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Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint

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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

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surd

mathematics

Learn about this topic in these articles:

incommensurables

In Incommensurables
The discovery of surds (the square roots of numbers that are not squares) therefore undermined the Pythagoreans: no longer could a:b = c:d (where a and b, say, are relatively prime) imply that a = nc or b = nd, where n is some whole number. According to…
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