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  2. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    PiFast can also compute other irrational numbers like e and √ 2. It can also work at lesser efficiency with very little memory (down to a few tens of megabytes to compute well over a billion (10 9) digits). This tool is a popular benchmark in the overclocking community. PiFast 4.4 is available from Stu's Pi page. PiFast 4.3 is available from ...

  3. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    A method analogous to piece-wise linear approximation but using only arithmetic instead of algebraic equations, uses the multiplication tables in reverse: the square root of a number between 1 and 100 is between 1 and 10, so if we know 25 is a perfect square (5 × 5), and 36 is a perfect square (6 × 6), then the square root of a number greater than or equal to 25 but less than 36, begins with ...

  4. Bailey–Borwein–Plouffe formula - Wikipedia

    en.wikipedia.org/wiki/Bailey–Borwein–Plouffe...

    Bailey–Borwein–Plouffe formula. The Bailey–Borwein–Plouffe formula (BBP formula) is a formula for π. It was discovered in 1995 by Simon Plouffe and is named after the authors of the article in which it was published, David H. Bailey, Peter Borwein, and Plouffe. [1] Before that, it had been published by Plouffe on his own site. [2]

  5. Irrationality measure - Wikipedia

    en.wikipedia.org/wiki/Irrationality_measure

    Rational numbers have irrationality exponent 1, while (as a consequence of Dirichlet's approximation theorem) every irrational number has irrationality exponent at least 2. On the other hand, an application of Borel-Cantelli lemma shows that almost all numbers, including all algebraic numbers, have an irrationality exponent equal to 2. [3]: 246

  6. Irrational number - Wikipedia

    en.wikipedia.org/wiki/Irrational_number

    Irrational number. The number √ 2 is irrational. In mathematics, the irrational numbers (in- + rational) are all the real numbers that are not rational numbers. That is, irrational numbers cannot be expressed as the ratio of two integers. When the ratio of lengths of two line segments is an irrational number, the line segments are also ...

  7. Lagrange number - Wikipedia

    en.wikipedia.org/wiki/Lagrange_number

    If we don't allow √ 2 then we can increase the number on the right hand side of the inequality from 2 √ 2 to √ 221 /5. Repeating this process we get an infinite sequence of numbers √ 5, 2 √ 2, √ 221 /5, ... which converge to 3. These numbers are called the Lagrange numbers, and are named after Joseph Louis Lagrange.

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