High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Jean-Victor Poncelet (July 1, 1788 – December 22, 1867) was a French engineer and mathematician who served most notably as the commandant general of the Ecole Polytechnique. He is considered a reviver of projective geometry, and his work Traite des proprietes projectives des figures is considered the first definitive paper on the subject since Gerard Desargues' work on it in the 17th century. He later wrote an introduction to it; Applications d'analyse et de geometrie. As a mathematician, his most notable work was in projective geometry, in particular, his work on Feuerbach's theorem. He also made discoveries about projective harmonic conjugates; among these were the poles and polar lines associated with conic sections. These discoveries led to the principle of duality, and also aided in the development of complex numbers and projective geometry.

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