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  2. D - Wikipedia

    en.wikipedia.org/wiki/D

    D, or d, is the fourth letter of the Latin alphabet, ... In the hexadecimal (base 16) numbering system, D is a number that corresponds to the number 13 in decimal ...

  3. 4 - Wikipedia

    en.wikipedia.org/wiki/4

    The number of completed, numbered symphonies by Johannes Brahms. [90] The number of strings on a violin, a viola, a cello, double bass, a cuatro, a typical bass guitar, and a ukulele, and the number of string pairs on a mandolin. "Four calling birds" is the gift on the fourth day of Christmas in the carol "The Twelve Days of Christmas". [91]

  4. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    The idea of adding a fourth dimension appears in Jean le Rond d'Alembert's "Dimensions", published in 1754, [1] but the mathematics of more than three dimensions only emerged in the 19th century. The general concept of Euclidean space with any number of dimensions was fully developed by the Swiss mathematician Ludwig Schläfli before 1853.

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    This is the minimum number of characters needed to encode a 32 bit number into 5 printable characters in a process similar to MIME-64 encoding, since 85 5 is only slightly bigger than 2 32. Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89

  6. D (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/D_(disambiguation)

    D and d, the derivative operators; d, the symbol for the total differential operator; in a related but more general meaning, it is the exterior derivative operator in differential geometry; d, often a variable for the diameter of a circle in geometry; d(n), Divisor function, the number of positive divisors of an integer n

  7. Ordinal numeral - Wikipedia

    en.wikipedia.org/wiki/Ordinal_numeral

    Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced.

  8. Delta (letter) - Wikipedia

    en.wikipedia.org/wiki/Delta_(letter)

    Delta (/ ˈ d ɛ l t ə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, ) [2] is the fourth letter of the Greek alphabet. In the system of Greek numerals, it has a value of four. It was derived from the Phoenician letter dalet 𐤃. [3] Letters that come from delta include the Latin D and the Cyrillic Д.

  9. Quaternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Quaternary_numeral_system

    Quaternary / k w ə ˈ t ɜːr n ər i / is a numeral system with four as its base.It uses the digits 0, 1, 2, and 3 to represent any real number.Conversion from binary is straightforward.