18 มกราคม
1856 : Birthdate of Luigi Bianchi , an Italian geometer who worked on non-Euclidean geometry .
19 มกราคม
1590 : Giovanni Battista Benedetti died. In one of his books he forecast his death for 1592. Hence, on his deathbed, he recomputed his horoscope and declared that an error of four minutes must have been made in the original date, thus evincing his lifelong faith in the doctrines of judicial astrology.
1833 : Birthdate of Rudolf Clebsch who worked on invariant theory .
1879 : Fubini born.
20 มกราคม
1834 : William Watson born in Nantucket, MA. In 1862, he earned his Ph.D at the University of Jena, being the first American to receive a Ph.D. in mathematics at a foreign university. Later he taught at Harvard and MIT. In the same year Yale was the first American school to grant a Ph.D. in mathematics.
21 มกราคม
1860 : Birthdate of David Eugene Smith , historian of mathematics
1874 : Baire born.
22 มกราคม
1775 : Andre-Marie Ampere born.
1874 : Leonard Eugene Dickson born.
1889 : Oskar Bolza gives his first lecture to a non-German audience. At Johns Hopkins he gave twenty lectures "on the theory of substitution groups and its application to algebraic equations." This was the first course on Galois theory in this country. It was published in 1891 in the American Journal of Mathematics.
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