Ernest Jean Philippe Fauque de Jonquières

Ernest Jean Philippe Fauque de Jonquières

Ernest Jean Philippe Fauque de Jonquières (born July 3, 1820 in Carpentras , † August 12, 1901 in Mousans-Sartoux near Grasse ) was a French mathematician and naval officer.

Jonquières attended the Naval School in Brest and was then in the French Navy. In 1841 he became a lieutenant and from 1849 to 1850 he served on the Admiralty's staff in Paris. During this time he became a close associate of Michel Chasles , whose works he had studied. Even during his later time at sea, he continued his mathematical studies and in 1862 won part of the Grand Prize of the French Academy of Sciences . In 1865 he became a captain and was sent to Saigon to organize a French agricultural and industrial exhibition. He played an important role in the development as a French colony. Later he was head of the naval depot and the maps and plans department. In 1874 he became Vice Admiral and in 1885 he retired.

In 1884 he was elected to the French Academy of Sciences.

As a mathematician, he dealt with geometry, building on the works of Chasles and Jean-Victor Poncelet . He dealt with the geometry of algebraic curves and surfaces and counting geometry. Later he also dealt with number theory and the theory of polyhedra, where he discovered that the Euler characteristic was to be found before Leonhard Euler with Descartes . In 1859 (before Cremona in 1863) he introduced a special form of the Cremona transformation.

Fonts

• Mélanges de géométrie pure , 1856
• Notice sur la carrière maritime administrative et scientifique du Vice-Admiral de Jonquières , Paris 1883 (autobiography)

Web links

• John J. O'Connor, Edmund F. Robertson :  Ernest Jean Philippe Fauque de Jonquières. In: MacTutor History of Mathematics archive .