his lost algebra and other discoveries
41geometry — /jee om i tree/, n. 1. the branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties… …
42History of astronomy — History of science …
43Leonhard Euler — Infobox Scientist name = Leonhard Euler|box width = 300px |200px image width = 200px caption = Portrait by Johann Georg Brucker birth date = birth date|df=yes|1707|4|15 birth place = Basel, Switzerland death date = 18 September (O.S 7 September)… …
44Pythagorean theorem — See also: Pythagorean trigonometric identity The Pythagorean theorem: The sum of the areas of the two squares on the legs (a and b) equals the area of the square on the hypotenuse (c) …
45Crusades — This article is about the 11th, 12th and 13th century religious military campaigns. For other uses, see Crusade (disambiguation) and Crusader (disambiguation). The …
4611th century — As a means of recording the passage of time, the 11th century is the period from 1001 to 1100 in accordance with the Julian calendar in the Christian/Common Era. In the history of European culture, this period is considered the early part of the… …
47Euclid's Elements — (Greek: polytonic|Στοιχεῖα) is a mathematical and geometric treatise consisting of 13 books written by the Greek mathematician Euclid in Alexandria circa 300 BC. It comprises a collection of definitions, postulates (axioms), propositions… …
48List of Russian people — The Millennium of Russia monument in Veliky Novgorod, featuring the statues and reliefs of the most celebrated people in the first 1000 years of Russian history …
49Bertrand Russell — Infobox Philosopher region = Western Philosophy era = 20th century philosophy color = #B0C4DE image caption = Russell in 1907 image size = 150px name = Bertrand Arthur William Russell, 3rd Earl Russell birth = birth date|df=yes|1872|5|18 Trellech …
50physical science, principles of — Introduction the procedures and concepts employed by those who study the inorganic world. physical science, like all the natural sciences, is concerned with describing and relating to one another those experiences of the surrounding… …
