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Jean Victor Poncelet[zhAN´ vEktOr´ pONslA´] Pronunciation Key, 1788–1867, French mathematician and army engineer. He taught at the school of mechanics at Metz and at the FacultE des Sciences and the Ecole Polytechnique, both in Paris. While a prisoner of war (1813–14) in Russia during Napoleon I's campaign, he evolved the foundations of the modern form of projective geometry and incorporated his results in TraitE des propriEtEs projectives des figures (1822; 2d ed., 2 vol., 1865–66).
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