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  2. 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.

  3. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Algebra (and later, calculus) can thus be used to solve geometrical problems. Geometry was split into two new subfields: synthetic geometry, which uses purely geometrical methods, and analytic geometry, which uses coordinates systemically. [23] Analytic geometry allows the study of curves unrelated to circles and lines.

  4. Encyclopædia Britannica - Wikipedia

    en.wikipedia.org/wiki/Encyclopædia_Britannica

    The 5th and 6th editions were reprints of the 4th, and the 10th edition was only a supplement to the 9th, just as the 12th and 13th editions were supplements to the 11th. The 15th underwent massive reorganization in 1985, but the updated, current version is still known as the 15th.

  5. HTML - Wikipedia

    en.wikipedia.org/wiki/HTML

    First informal draft of the HTML DTD, [34] with seven subsequent revisions (July 15, August 6, August 18, November 17, November 19, November 20, November 22) [35] [36] [37] November 1992 HTML DTD 1.1 (the first with a version number, based on RCS revisions, which start with 1.1 rather than 1.0), an informal draft [ 37 ]

  6. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    The magnitude of such precision (152 decimal places) can be put into context by the fact that the circumference of the largest known object, the observable universe, can be calculated from its diameter (93 billion light-years) to a precision of less than one Planck length (at 1.6162 × 10 −35 meters, the shortest unit of length expected to be ...

  7. Protestantism - Wikipedia

    en.wikipedia.org/wiki/Protestantism

    The word evangelical (German: evangelisch), which refers to the gospel, was widely used for those involved in the religious movement in the German-speaking area beginning in 1517. [20] Evangelical is still preferred among some of the historical Protestant denominations in the Lutheran, Calvinist, and United (Lutheran and Reformed) Protestant ...

  8. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    With the exceptions of 1, 8 and 144 (F 1 = F 2, F 6 and F 12) every Fibonacci number has a prime factor that is not a factor of any smaller Fibonacci number (Carmichael's theorem). [57] As a result, 8 and 144 (F 6 and F 12) are the only Fibonacci numbers that are the product of other Fibonacci numbers. [58]

  9. List of Indian inventions and discoveries - Wikipedia

    en.wikipedia.org/wiki/List_of_Indian_inventions...

    Indian mathematicians were aware of negative numbers by the 7th century, [170] and their role in mathematical problems of debt was understood. [171] Mostly consistent and correct rules for working with negative numbers were formulated, [ 172 ] and the diffusion of these rules led the Arab intermediaries to pass it on to Europe., [ 171 ] for ...