Poincaré was born on 29 April 1854 in Cité Ducale neighborhood, Nancy, Meurthe-et-Moselle into an influential family. His father Leon Poincaré (1828–1892) was a professor of medicine at the Univer ...
Optical 3d measuring systems use this principle as well in order to determine the spatial dimensions and the geometry of an item. Basically, the configuration consists of two sensors observing the ite ...
In elliptic geometry, two lines perpendicular to a given line must intersect. In fact, the perpendiculars on one side all intersect at the absolute pole of the given line. The perpendiculars on the ot ...
Riemann was born in Breselenz, a village near Dannenberg in the Kingdom of Hanover in what is the Federal Republic of Germany today. His father, Friedrich Bernhard Riemann, was a poor Lutheran pastor ...
The definitions given above are only valid for circles, spheres and convex shapes. However, they are special cases of a more general definition that is valid for any kind of n-dimensional convex or no ...
The circumference of a circle is the distance around it. The term is used when measuring physical objects, as well as when considering abstract geometric forms.When a circle's radius is 1, its circumf ...
Arc: any connected part of the circle.Centre: the point equidistant from the points on the circle.Chord: a line segment whose endpoints lie on the circle.Circular sector: a region bounded by two radii ...
Main article: Infinity (philosophy)Ancient cultures had various ideas about the nature of infinity. The ancient Indians and Greeks did not define infinity in precise formalism as does modern mathemati ...
An interesting property of hyperbolic geometry follows from the occurrence of more than one line parallel to R through a point P, not on R: there are two classes of non-intersecting lines. Let B be th ...
Russian and later Soviet cinema was a hotbed of invention in the period immediately following the 1917, resulting in world-renowned films such as The Battleship Potemkin by Sergei Eisenstein. Eisenste ...
Main articles: Timeline of Russian inventions and technology records, Science and technology in Russia, List of Russian scientists and List of Russian inventorsMikhail Lomonosov, polymath scientist, i ...
The Russian military is divided into the Ground Forces, Navy, and Air Force. There are also three independent arms of service: Strategic Missile Troops, Aerospace Defence Forces, and the Airborne Troo ...
Russia Listeni/?r???/ or /?r???/ (Russian: Россия, tr. Rossiya, IPA: ( listen)), also officially known as the Russian Federation (Russian: Российская Федерация, tr. R ...
Lobachevsky is the subject of songwriter/mathematician Tom Lehrer's humorous song "Lobachevsky" from his Songs by Tom Lehrer album. In the song, Lehrer portrays a Russian mathematician who sings about ...
