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  2. Vigesimal - Wikipedia

    en.wikipedia.org/wiki/Vigesimal

    In a vigesimal place system, twenty individual numerals (or digit symbols) are used, ten more than in the decimal system. One modern method of finding the extra needed symbols is to write ten as the letter A, or A 20, where the 20 means base 20, to write nineteen as J 20, and the numbers between with the corresponding letters of the alphabet.

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]

  4. Table of bases - Wikipedia

    en.wikipedia.org/wiki/Table_of_bases

    0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0: 0 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1 ...

  5. Leibniz formula for π - Wikipedia

    en.wikipedia.org/wiki/Leibniz_formula_for_π

    In mathematics, the Leibniz formula for π, named after Gottfried Wilhelm Leibniz, states that = + + = = +,. an alternating series.. It is sometimes called the Madhava–Leibniz series as it was first discovered by the Indian mathematician Madhava of Sangamagrama or his followers in the 14th–15th century (see Madhava series), [1] and was later independently rediscovered by James Gregory in ...

  6. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    He also gave two other approximations of π: π ≈ 22 ⁄ 7 and π ≈ 355 ⁄ 113, which are not as accurate as his decimal result. The latter fraction is the best possible rational approximation of π using fewer than five decimal digits in the numerator and denominator. Zu Chongzhi's results surpass the accuracy reached in Hellenistic ...

  7. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or ⁠ ⁠, where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include ⁠ 1 2 ⁠, − ⁠ 8 5 ⁠, ⁠ −8 5 ⁠, and ⁠ 8 −5 ⁠.

  8. Senary - Wikipedia

    en.wikipedia.org/wiki/Senary

    Prime factors of one above the base: 11: Senary base Prime factors of the base: 2, 3 Prime factors of one below the base: 5 Prime factors of one above the base: 7 (=11 6) Fraction Prime factors of the denominator Positional representation Positional representation Prime factors of the denominator Fraction ⁠ 1 / 2 ⁠ 2: 0.5: 0.3: 2 ⁠ 1 / 2 ...

  9. List of musical works in unusual time signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_works_in...

    The two-bar chorus groove is in 11 4 time. [177] Custer and Sitting Bull by Kyle Gann, in some measures (70, 72, 75, etc.) of part 3 and the beginning of part 4. [115] "Eight Ball, Coroner's Pocket" by Hail the Sun, intro is composed in 9 4, and 11 4. [178] "Eleven Four", by Paul Desmond and recorded by the Dave Brubeck Quartet. [179]

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