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  2. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    There are many areas of mathematics, which include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study of shapes and spaces that contain them), analysis (the study of continuous changes), and set theory (presently used as a foundation for all mathematics).

  3. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    σ x should usually be quoted to only one or two significant figures, as more precision is unlikely to be reliable or meaningful: 1.79 ± 0.06 (correct), 1.79 ± 0.96 (correct), 1.79 ± 1.96 (incorrect). The digit positions of the last significant figures in x best and σ x are the same, otherwise the consistency is lost. For example, "1.79 ± ...

  4. Bayes' theorem - Wikipedia

    en.wikipedia.org/wiki/Bayes'_theorem

    Once again, the answer can be reached without using the formula by applying the conditions to a hypothetical number of cases. For example, if the factory produces 1,000 items, 200 will be produced by A, 300 by B, and 500 by C. Machine A will produce 5% × 200 = 10 defective items, B 3% × 300 = 9, and C 1% × 500 = 5, for a total of 24.

  5. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    A little algebra shows that the distance between P and M (which is the same as the orthogonal distance between P and the line L) (¯) is equal to the standard deviation of the vector (x 1, x 2, x 3), multiplied by the square root of the number of dimensions of the vector (3 in this case).

  6. Mathematical coincidence - Wikipedia

    en.wikipedia.org/wiki/Mathematical_coincidence

    That is, where m is the number of miles, k is the number of kilometres and e is Euler's number. A density of one ounce per cubic foot is very close to one kilogram per cubic metre: 1 oz/ft 3 = 1 oz × 0.028349523125 kg/oz / (1 ft × 0.3048 m/ft) 3 ≈ 1.0012 kg/m 3 .

  7. Lorentz factor - Wikipedia

    en.wikipedia.org/wiki/Lorentz_factor

    The Lorentz transformation: The simplest case is a boost in the x-direction (more general forms including arbitrary directions and rotations not listed here), which describes how spacetime coordinates change from one inertial frame using coordinates (x, y, z, t) to another (x ′, y ′, z ′, t ′) with relative velocity v: ′ = (), ′ = ().

  8. Omega - Wikipedia

    en.wikipedia.org/wiki/Omega

    In set theory, ω is the ordinal number [27] A primitive root of unity, like the complex cube roots of 1; The Wright Omega function [28] A generic differential form; In number theory, ω(n) is the number of distinct prime divisors of n [29] In number theory, an arithmetic function; In combinatory logic, the self-application combinator, (λ x. x x)

  9. Birthday attack - Wikipedia

    en.wikipedia.org/wiki/Birthday_attack

    Let be the number of possible values of a hash function, with =. With a birthday attack, it is possible to find a collision of a hash function with 50 % {\textstyle 50\%} chance in 2 l = 2 l / 2 , {\textstyle {\sqrt {2^{l}}}=2^{l/2},} where l {\textstyle l} is the bit length of the hash output, [ 1 ] [ 2 ] and with 2 l − 1 {\textstyle 2^{l-1 ...

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