Sun Guangyuan (, 1900–1979), also known as Sun Tang (孫鎕), was a Chinese mathematician.
He studied projective geometry under Ernest Preston Lane at the University of Chicago.. Later Sun became a professor in Tsinghua University, Beijing.
Sun used Ernest Julius Wilczynski's expression of a ruled surface given via two linear homogeneous differential equations in a 1927 publication.Dan Sun (1927,8) "Osculating derivative of a ruled surface", Annals of Mathematics 29(1-4): 95–105
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