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  2. Equation solving - Wikipedia

    en.wikipedia.org/wiki/Equation_solving

    In mathematics, to solve an equation is to find its solutions, which are the values (numbers, functions, sets, etc.) that fulfill the condition stated by the equation, consisting generally of two expressions related by an equals sign. When seeking a solution, one or more variables are designated as unknowns. A solution is an assignment of ...

  3. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    The Twenty-One Card Trick, also known as the 11th card trick or three column trick, is a simple self-working card trick that uses basic mathematics to reveal the user's selected card. The game uses a selection of 21 cards out of a standard deck. These are shuffled and the player selects one at random.

  4. Extraneous and missing solutions - Wikipedia

    en.wikipedia.org/wiki/Extraneous_and_missing...

    In mathematics, an extraneous solution (or spurious solution) is one which emerges from the process of solving a problem but is not a valid solution to it. [1] A missing solution is a valid one which is lost during the solution process.

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Mathematics is essential in the natural sciences, engineering, medicine, finance, computer science, and the social sciences. Although mathematics is extensively used for modeling phenomena, the fundamental truths of mathematics are independent of any scientific experimentation.

  6. ISO 31-11 - Wikipedia

    en.wikipedia.org/wiki/ISO_31-11

    ISO 31-11:1992 was the part of international standard ISO 31 that defines mathematical signs and symbols for use in physical sciences and technology. It was superseded in 2009 by ISO 80000-2:2009 and subsequently revised in 2019 as ISO-80000-2:2019 .

  7. Louis Armstrong - Wikipedia

    en.wikipedia.org/wiki/Louis_Armstrong

    Armstrong spent his youth in poverty in a rough neighborhood known as The Battlefield, [11] on the southern section of Rampart Street. [12] At the age of six, Armstrong started attending the Fisk School for Boys, [ 13 ] a school that accepted black children in the racially segregated school system of New Orleans.

  8. 11th Mountain Infantry Battalion - Wikipedia

    en.wikipedia.org/wiki/11th_Mountain_Infantry...

    The 11th Mountain Infantry Battalion (Portuguese: 11.° Batalhão de Infantaria de Montanha) is a unit of the Brazilian Army, which specializes in fighting in the mountain environment, improving and developing special techniques for mountain operations and using weapons and equipment specific to this theater.