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  2. Alphabetic numeral system - Wikipedia

    en.wikipedia.org/wiki/Alphabetic_numeral_system

    An alphabetic numeral system employs the letters of a script in the specific order of the alphabet in order to express numerals. In Greek, letters are assigned to respective numbers in the following sets: 1 through 9, 10 through 90, 100 through 900, and so on. Decimal places are represented by a single symbol.

  3. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Redundant, but sometimes used for emphasizing that a number is positive, specially when other numbers in the context are or may be negative; for example, +2. 3. Sometimes used instead of for a disjoint union of sets. − 1. Denotes subtraction and is read as minus; for example, 32. 2.

  4. Page numbering - Wikipedia

    en.wikipedia.org/wiki/Page_numbering

    Page number in a book. Page numbering is the process of applying a sequence of numbers (or letters, or Roman numerals) to the pages of a book or other document. The number itself, which may appear in various places on the page, can be referred to as a page number or as a folio. [ 1] Like other numbering schemes such as chapter numbering, page ...

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  6. The Library of Babel (website) - Wikipedia

    en.wikipedia.org/wiki/The_Library_of_Babel_(website)

    The algorithm Basile created generates a 'book' by iterating every permutation of 29 characters: the 26 English letters, space, comma, and period. [8] Each book is marked by a coordinate, corresponding to its place on the hexagonal library (hexagon name, wall number, shelf number, and book name) so that every book can be found at the same place every time.

  7. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Lucas numbers have L 1 = 1, L 2 = 3, and L n = L n−1 + L n−2. Primefree sequences use the Fibonacci recursion with other starting points to generate sequences in which all numbers are composite. Letting a number be a linear function (other than the sum) of the 2 preceding numbers. The Pell numbers have P n = 2P n−1 + P n−2.

  8. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Main article: list of numeral systems. Decimal: The standard Hindu–Arabic numeral system using base ten. Binary: The base-two numeral system used by computers, with digits 0 and 1. Ternary: The base-three numeral system with 0, 1, and 2 as digits. Quaternary: The base-four numeral system with 0, 1, 2, and 3 as digits.

  9. Isopsephy - Wikipedia

    en.wikipedia.org/wiki/Isopsephy

    Isopsephy ( / ˈaɪsəpˌsɛfi /; Greek: ἴσος, romanized : ísos meaning "equal" and Greek: ψῆφος, romanized : psêphos, lit. 'pebble' meaning "count") or isopsephism is the practice of adding up the number values of the letters in a word to form a single number. [ 1] The total number is then used as a metaphorical bridge to other ...