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See also:POINSOT, See also:- LOUIS
- LOUIS (804–876)
- LOUIS (893–911)
- LOUIS, JOSEPH DOMINIQUE, BARON (1755-1837)
- LOUIS, or LEWIS (from the Frankish Chlodowich, Chlodwig, Latinized as Chlodowius, Lodhuwicus, Lodhuvicus, whence-in the Strassburg oath of 842-0. Fr. Lodhuwigs, then Chlovis, Loys and later Louis, whence Span. Luiz and—through the Angevin kings—Hungarian
LOUIS (1777–1859) , See also:French mathematician, was See also:born at See also:Paris on the 3rd of See also:January 1777. In 1794 he became a See also:scholar at the Ecole Polytechnique, which he See also:left in 1796 to See also:act as a See also:civil engineer. In 1804 he was appointed See also:professor of See also:mathematics at the Lycee, in 1809 professor of See also:analysis and See also:mechanics, and in 1816 examiner at the Ecole Polytechnique: On the See also:death of J. L. See also:Lagrange, in 1813, Poinsot was elected to his See also:place in the Academie See also:des Sciences; and in 184o he became a member of the See also:superior See also:council of public instruction. In 1846 he was made an officer of the See also:Legion of See also:Honour; and on the formation of the See also:senate in 1852 he was chosen a member of that See also:body. He died at Paris on the 5th of See also:December 1859.
Poinsot's earliest See also:work was his Elemens de statique (1803; 9th edition, 1848), in which he introduces the See also:idea of statical couples and investigates their properties. In the Theorie nouvelle de la rotation des See also:corps (1834) he treats the See also:motion of a rigid body geometrically, and shows that the most See also:general motion of such a body can be represented at any instant by a rotation about an See also:axis combined with a See also:translation parallel to this axis,and that any motion of a body of which one point is fixed may be produced by the See also:rolling of a See also:cone fixed in the body on a cone fixed in space. The previous treatment of the motion of a rigid body had in every See also:case been purely See also:analytical, and so gave no aid to the formation of a See also:mental picture of the body's motion; and the See also:great value of this work lies in the fact that, as Poinsot himself says in the introduction, it enables us to represent to ourselves the motion of a rigid body as clearly as that of a moving point. In addition to See also:publishing a number of See also:works on geometrical and See also:mechanical subjects, Poinsot also contributed
a number of papers on pure and applied mathematics to Lionville's See also:Journal and other scientific See also:periodicals.
See J. L. F. See also:Bertrand, Discours aux funerailles de Poinsot (Paris, 1860).
End of Article: POINSOT, LOUIS (1777–1859)
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