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Euler's identity. In mathematics, Euler's identity [note 1] (also known as Euler's equation) is the equality. is pi, the ratio of the circumference of a circle to its diameter. Euler's identity is named after the Swiss mathematician Leonhard Euler. It is a special case of Euler's formula when evaluated for .
The Euler characteristic χ was classically defined for the surfaces of polyhedra, according to the formula. where V, E, and F are respectively the numbers of v ertices (corners), e dges and f aces in the given polyhedron. Any convex polyhedron 's surface has Euler characteristic. This equation, stated by Euler in 1758, [2] is known as Euler's ...
Gmail is the email service provided by Google. As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. [1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party email ...
Login.gov is a single sign-on solution for US government websites. It enables users to log in to services from numerous government agencies using the same username and password. Login.gov was jointly developed by 18F and the US Digital Service . [1]
Orthogonal basis. In mathematics, particularly linear algebra, an orthogonal basis for an inner product space is a basis for whose vectors are mutually orthogonal. If the vectors of an orthogonal basis are normalized, the resulting basis is an orthonormal basis .
Polarization identity. In linear algebra, a branch of mathematics, the polarization identity is any one of a family of formulas that express the inner product of two vectors in terms of the norm of a normed vector space. If a norm arises from an inner product then the polarization identity can be used to express this inner product entirely in ...
4 July 1991 (age 32) Otrokovice, Czechoslovakia. Occupation. Actress. Years active. 2012–present. Pavla Gajdošíková (born 4 July 1991) is a Czech actress. She won the Czech Lion Award for Best Actress in Leading Role for her performance as Ema in Mistakes. [1] [2]
Axis prisoners of war (Germans, Italians, Romanians, Hungarians) Soviet troops fighting in a destroyed workshop. Sturmgeschütz III, operated by the German Wehrmacht. Date. 17 July 1942 [Note 2] – 2 February 1943 [Note 3] (6 months, 2 weeks and 2 days) Location. Stalingrad, Russian SFSR, Soviet Union. 48°42′N 44°31′E.