Une voix dans le désertUne voix dans le désert ("A Voice in the Desert") is a recitation, with a soprano soloist and orchestra, written by the English composer Edward Elgar in 1915 as his Op. 77. The French words are by the Belgian poet Émile Cammaerts. It was first produced, in London at the Shaftesbury Theatre, on 29 January 1916, with the recitation by the Belgian dramatic performer Carlo Liten, the soprano Olga Lynn, and an orchestra conducted by the composer. The words were translated into English by Cammaerts' wife, Tita Brand.
Projective connectionIn differential geometry, a projective connection is a type of Cartan connection on a differentiable manifold. The structure of a projective connection is modeled on the geometry of projective space, rather than the affine space corresponding to an affine connection. Much like affine connections, projective connections also define geodesics. However, these geodesics are not affinely parametrized. Rather they are projectively parametrized, meaning that their preferred class of parameterizations is acted upon by the group of fractional linear transformations.
David Bierens de HaanDavid Bierens de Haan (3 May 1822, in Amsterdam – 12 August 1895, in Leiden) was a Dutch mathematician and historian of science. Bierens de Haan was a son of the rich merchant Abraham Pieterszoon de Haan (1795–1880) and Catharina Jacoba Bierens (1797–1835). In 1843 he completed a study in the exact sciences and received his PhD from the University of Leiden in 1847 under Gideon Janus Verdam (1802–1866) for the work De Lemniscata Bernouillana. After this he became a teacher of physics and mathematics at a gymnasium in Deventer.
