Percey Franklyn Smith (August 21, 1867 – June 3, 1956) was an American

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

and

professor Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other tertiary education, post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin ...

of mathematics at

Sheffield Scientific School Sheffield Scientific School was founded in 1847 as a school of Yale University, Yale College in New Haven, Connecticut, for instruction in science and engineering. Originally named the Yale Scientific School, it was renamed in 1861 in honor of Jos ...

Yale University Yale University is a Private university, private Ivy League research university in New Haven, Connecticut, United States. Founded in 1701, Yale is the List of Colonial Colleges, third-oldest institution of higher education in the United Stat ...

. Smith was born in

Nyack, New York Nyack () is a Village (New York), village primarily located in the Town (New York), town of Orangetown, New York, Orangetown in Rockland County, New York, United States. Incorporated in 1872, a small western section of the village lies in Clarkst ...

. He studied mathematics at

of Yale College, finishing the regular course in 1888 and receiving the

Doctor of Philosophy A Doctor of Philosophy (PhD, DPhil; or ) is a terminal degree that usually denotes the highest level of academic achievement in a given discipline and is awarded following a course of Postgraduate education, graduate study and original resear ...

in 1891. Starting in 1888 he was instructor for mathematics in Yale until 1894, followed by academic studies in

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

and

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

at the universities of

Göttingen Göttingen (, ; ; ) is a college town, university city in Lower Saxony, central Germany, the Capital (political), capital of Göttingen (district), the eponymous district. The River Leine runs through it. According to the 2022 German census, t ...

Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...

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. After returning to Yale in 1896 he was assistant professor of mathematics until 1900, then professor until 1936. He wrote several papers related to

Lie sphere geometry Lie sphere geometry is a geometrical theory of planar or spatial geometry in which the fundamental concept is the circle or sphere. It was introduced by Sophus Lie in the nineteenth century. The main idea which leads to Lie sphere geometry is t ...

, and is the author of several textbooks such as ''The elements of analytic geometry'' (1904), ''New analytic geometry'' (1912), ''Theoretical mechanics'' (1910). He married Julia C. Lum on December 23, 1890. He died at his home in

Hamden, Connecticut Hamden is a New England town, town in New Haven County, Connecticut, United States. The town's nickname is "The Land of the Sleeping Giant (Connecticut), Sleeping Giant". The town is part of the South Central Connecticut Planning Region, Connecti ...

on June 3, 1956. The title "Percey F. Smith Professor of Mathematics" is still used in Yale.Van Ha Vu is appointed the Percey F. Smith Professorship of Mathematics
/ref> He was a member of the

Connecticut Academy of Arts and Sciences The Connecticut Academy of Arts and Sciences is a learned society founded in 1799 in New Haven, Connecticut "to cultivate every art and science which may tend to advance the interest and happiness of a free and virtuous people." Its purpose is the ...

Publications (selection)

References

{{DEFAULTSORT:Smith, Percey Franklyn 19th-century American mathematicians 20th-century American mathematicians 1867 births 1956 deaths Yale University alumni Yale University faculty People from Nyack, New York Mathematicians from New York (state)