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  2. Repdigit - Wikipedia

    en.wikipedia.org/wiki/Repdigit

    In recreational mathematics, a repdigit or sometimes monodigit [1] is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal). The word is a portmanteau of "repeated" and "digit". Examples are 11, 666, 4444, and 999999.

  3. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    In the 19th century, the internal development of geometry (pure mathematics) led to definition and study of non-Euclidean geometries, spaces of dimension higher than three and manifolds. At this time, these concepts seemed totally disconnected from the physical reality, but at the beginning of the 20th century, Albert Einstein developed the ...

  4. Logarithm - Wikipedia

    en.wikipedia.org/wiki/Logarithm

    In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63] For instance, pH is the decimal cologarithm of the activity of hydronium ions (the form hydrogen ions H + take in water). [64] The activity of hydronium ions in neutral water is 10 −7 mol·L −1, hence a pH of 7. Vinegar typically ...

  5. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The decimal expansion of the golden ratio ⁠ ⁠ [1] has been calculated to an accuracy of ten trillion (⁠ = ⁠) digits. [ 66 ] In the complex plane , the fifth roots of unity ⁠ z = e 2 π k i / 5 {\displaystyle \textstyle z=e^{2\pi ki/5}} ⁠ (for an integer ⁠ k {\displaystyle k} ⁠ ) satisfying ⁠ z 5 = 1 {\displaystyle \textstyle z ...

  6. Simple continued fraction - Wikipedia

    en.wikipedia.org/wiki/Simple_continued_fraction

    A simple or regular continued fraction is a continued fraction with numerators all equal one, and denominators built from a sequence {} of integer numbers. The sequence can be finite or infinite, resulting in a finite (or terminated) continued fraction like

  7. Normal distribution - Wikipedia

    en.wikipedia.org/wiki/Normal_distribution

    Other definitions of the -function, all of which are simple transformations of , are also used occasionally. [13] The graph of the standard normal cumulative distribution function has 2-fold rotational symmetry around the point (0,1/2); that is, () = ().

  8. 0 - Wikipedia

    en.wikipedia.org/wiki/0

    For example, the decimal number 205 is the sum of two hundreds and five ones, with the 0 digit indicating that no tens are added. The digit plays the same role in decimal fractions and in the decimal representation of other real numbers (indicating whether any tenths, hundredths, thousandths, etc., are present) and in bases other than 10 (for ...

  9. Elections in Greece - Wikipedia

    en.wikipedia.org/wiki/Elections_in_Greece

    A rather complicated set of rules deals with rounding decimal results up or down, and ensures that the smaller a constituency is, the more strictly proportional its parliamentary representation will be. Another set of rules apportions the 50 seat premium for the largest-tallying party among constituencies.