arc hyperbolic function
61Indian Rebellion of 1857 — Sepoy Mutiny redirects here. For other uses, see Sepoy Mutiny (disambiguation). Indian Rebellion of 1857 A 1912 map of Northern India The Revolt of 1857–59 showing the centres of rebellion including the principal ones …
62Solar sail — Solar sails (also called light sails or photon sails, especially when they use light sources other than the Sun) are a proposed form of spacecraft propulsion using large membrane mirrors. Radiation pressure is about 10 5 Pa at Earth s distance… …
63Sine-Gordon equation — The sine Gordon equation is a nonlinear hyperbolic partial differential equation in 1+1 dimensions involving the d Alembert operator and the sine of the unknown function. It was originally considered in the nineteenth century in the course of… …
64Congruence (general relativity) — In general relativity, a congruence (more properly, a congruence of curves) is the set of integral curves of a (nowhere vanishing) vector field in a four dimensional Lorentzian manifold which is interpreted physically as a model of spacetime.… …
65University of Birmingham — Infobox University name = University of Birmingham image size = 234px motto = la. Per Ardua Ad Alta mottoeng = Through hard work, great heights are achieved established = 1825, with Royal Charter granted in 1900 city = Birmingham state = West… …
66Pi — Pour les articles homonymes, voir Pi (homonymie). Si le diamètre du cercle est 1, sa circonférence est π. Pi[1 …
67C/2010 X1 — For beliefs regarding a supposed collision between Earth and Comet Elenin, see Nibiru collision. C/2010 X1 (Elenin) Comet Elenin as seen by the STEREO B spacecraft on August 1st, 2011. Discovery Discovered by: Leonid Elenin 0.45 m reflector (H15) …
68Existence (Philosophy of) 2 — Philosophy of existence 2 Sartre Thomas R.Flynn Born 21 June 1905, in Thiviers (Dordogne), Jean Paul Sartre was raised in the Parisian home of his widowed mother’s parents. After his mother’s remarriage, he spent several years with her and his… …
