High Quality Content by WIKIPEDIA articles! Marius Sophus Lie (17 December 1842 - 18 February 1899) was a Norwegian mathematician. He largely created the theory of continuous symmetry, and applied it to the study of geometry and differential equations. Sophus Lie was born in Nordfjordeid, Norway, the youngest of six children. As a young man, he intended to pursue a military career, but due to his myopia, he instead became a student at the University of Oslo. He obtained his Ph.D. at that university in 1872, with a thesis entitled On a class of geometric transformations.

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