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  2. Chopsticks (hand game) - Wikipedia

    en.wikipedia.org/wiki/Chopsticks_(hand_game)

    Chopsticks (sometimes called Calculator, or just Sticks) [citation needed] is a hand game for two or more players, in which players extend a number of fingers from each hand and transfer those scores by taking turns tapping one hand against another. [ 1][ 2] Chopsticks is an example of a combinatorial game, and is solved in the sense that with ...

  3. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

  4. Monty Hall problem - Wikipedia

    en.wikipedia.org/wiki/Monty_Hall_problem

    Monty Hall problem. In search of a new car, the player chooses a door, say 1. The game host then opens one of the other doors, say 3, to reveal a goat and offers to let the player switch from door 1 to door 2. The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let ...

  5. Countdown (game show) - Wikipedia

    en.wikipedia.org/wiki/Countdown_(game_show)

    8 Out of 10 Cats Does Countdown. Celebrity Countdown. Countdown is a British game show involving word and mathematical tasks that began airing in November 1982. It is broadcast on Channel 4 and is currently presented by Colin Murray, assisted by Rachel Riley with lexicographer Susie Dent.

  6. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Slide rule. Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig) A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry.

  7. Right angle - Wikipedia

    en.wikipedia.org/wiki/Right_angle

    Solid. v. t. e. In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or ⁠ 2 ⁠ radians [ 1] corresponding to a quarter turn. [ 2] If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles. [ 3] The term is a calque of Latin angulus rectus; here rectus means ...

  8. Probability - Wikipedia

    en.wikipedia.org/wiki/Probability

    Probability is the branch of mathematics concerning events and numerical descriptions of how likely they are to occur. The probability of an event is a number between 0 and 1; the larger the probability, the more likely an event is to occur. [ note 1][ 1][ 2] A simple example is the tossing of a fair (unbiased) coin.

  9. Surreal number - Wikipedia

    en.wikipedia.org/wiki/Surreal_number

    Surreal number. A visualization of the surreal number tree. In mathematics, the surreal number system is a totally ordered proper class containing not only the real numbers but also infinite and infinitesimal numbers, respectively larger or smaller in absolute value than any positive real number. Research on the Go endgame by John Horton Conway ...