Sun Guangyuan (, 1900–1979), also known as Sun Tang (孫鎕), was a Chinese

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, structure, space, models, and change. History On ...

. He studied

projective geometry In mathematics, projective geometry is the study of geometric properties that are invariant with respect to projective transformations. This means that, compared to elementary Euclidean geometry, projective geometry has a different setting, pro ...

under Ernest Preston Lane at the

University of Chicago The University of Chicago (UChicago, Chicago, U of C, or UChi) is a private research university in Chicago, Illinois. Its main campus is located in Chicago's Hyde Park neighborhood. The University of Chicago is consistently ranked among the b ...

. Later Sun became a professor in

Tsinghua University Tsinghua University (; abbreviation, abbr. THU) is a National university, national Public university, public research university in Beijing, China. The university is funded by the Ministry of Education of the People's Republic of China, Minis ...

Beijing } Beijing ( ; ; ), alternatively romanized as Peking ( ), is the capital of the People's Republic of China. It is the center of power and development of the country. Beijing is the world's most populous national capital city, with over 21 ...

. Sun used

Ernest Julius Wilczynski Ernest Julius Wilczynski (November 13, 1876 – September 14, 1932) was an American mathematician considered the founder of projective differential geometry. Born in Hamburg, Germany, Wilczynski's family emigrated to America and settled in Chica ...

's expression of a

ruled surface In geometry, a surface is ruled (also called a scroll) if through every point of there is a straight line that lies on . Examples include the plane, the lateral surface of a cylinder or cone, a conical surface with elliptical directrix, the ...

given via two linear

homogeneous differential equation A differential equation can be homogeneous in either of two respects. A first order differential equation is said to be homogeneous if it may be written :f(x,y) \, dy = g(x,y) \, dx, where and are homogeneous functions of the same degree of an ...

s in a 1927 publication.Dan Sun (1927,8) "Osculating derivative of a ruled surface",

Annals of Mathematics The ''Annals of Mathematics'' is a mathematical journal published every two months by Princeton University and the Institute for Advanced Study. History The journal was established as ''The Analyst'' in 1874 and with Joel E. Hendricks as the ...

29(1-4): 95–105

References

{{DEFAULTSORT:Sun, Guangyuan 1900 births 1979 deaths 20th-century Chinese mathematicians Mathematicians from Zhejiang Geometers Academic staff of Tsinghua University Academic staff of the National Central University Academic staff of Nanjing University Scientists from Hangzhou Educators from Hangzhou