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  2. 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 ...

  3. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    When a number is written using ordinary decimal notation, leading zeros are not significant, and trailing zeros of numbers not written with a decimal point are implicitly considered to be non-significant. [110] For example, the numbers 0.056 and 1200 each have only 2 significant digits, but the number 40.00 has 4 significant digits.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The basic statements are not subject to proof because they are self-evident , or are part of the definition of the subject of study . This principle, foundational for all mathematics, was first elaborated for geometry, and was systematized by Euclid around 300 BC in his book Elements. [21] [22]

  5. 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 ...

  6. Interval (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Interval_(mathematics)

    The addition x + a on the number line. All numbers greater than x and less than x + a fall within that open interval.. In mathematics, a real interval is the set of all real numbers lying between two fixed endpoints with no "gaps".

  7. 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 ...

  8. Metallicity - Wikipedia

    en.wikipedia.org/wiki/Metallicity

    This word-use is distinct from the conventional chemical or physical definition of a metal as an electrically conducting solid. Stars and nebulae with relatively high abundances of heavier elements are called "metal-rich" when discussing metallicity, even though many of those elements are called nonmetals in chemistry.

  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.