Briançon

Briançon, CHARLES JULIEN, French mathematician, was born at Sèvres in 1783. Besides some important papers contributed to French mathematical journals, he has left small treatises on lines of the second order (1817), and the application of the theory of transversals (1818). He is best known by a theorem, the correlative of Pascal's, which he published in 1806. The theorem is, If a hexagon is circumscribed to a conic, the straight lines joining the three pairs of opposite vertices are concurrent. He died in 1864.