23 มกราคม
1862 : David Hilbert born.
24 มกราคม
1640 : John Pell wrote Mersenne that Thomas Harriot (1560-1621) had found the law of refraction, now known as Snell's law .
1798 : Von Staudt born.
25 มกราคม
1736 : Lagrange born.
1843 : H. A. Schwarz born.
1870 : H. von Koch born. He is noted for his snowflake curve.
26 มกราคม
1678 : Phillipe de LaHire nominated to the Academy of Sciences. This geometer was so adept at synthetic techniques that he, together with Rolle , was hostile to the infinitesimal calculus when discussions of its value were raised in the Academy beginning in 1701.
27 มกราคม
1695 : Nicolas II Bernoulli born.
1832 Charles Lutwidge Dodgson born. Although a mathematics professor, he wasn't much of a mathematician. Mathematicians appreciate his Alice books, written under the pseudonym, Lewis Carroll.
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