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  2. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    Excel maintains 15 figures in its numbers, but they are not always accurate; mathematically, the bottom line should be the same as the top line, in 'fp-math' the step '1 + 1/9000' leads to a rounding up as the first bit of the 14 bit tail '10111000110010' of the mantissa falling off the table when adding 1 is a '1', this up-rounding is not undone when subtracting the 1 again, since there is no ...

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    "A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [ 1 ] : 38 The term is not equivalent to radix , as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [ 1 ]

  4. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    Luhn algorithm. The Luhn algorithm or Luhn formula, also known as the " modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in US patent 2950048A, granted on 23 August 1960. [ 1]

  5. NACA airfoil - Wikipedia

    en.wikipedia.org/wiki/NACA_airfoil

    A: blue line = chord, green line = camber mean-line, B: leading-edge radius, C: xy coordinates for the profile geometry (chord = x axis; y axis line on that leading edge) The NACA airfoil series is a set of standardized airfoil shapes developed by this agency, which became widely used in the design of aircraft wings.

  6. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    Positional notation (or place-value notation, or positional numeral system) usually denotes the extension to any base of the Hindu–Arabic numeral system (or decimal system ). More generally, a positional system is a numeral system in which the contribution of a digit to the value of a number is the value of the digit multiplied by a factor ...

  7. Genealogical numbering systems - Wikipedia

    en.wikipedia.org/wiki/Genealogical_numbering_systems

    The system was created in 1870 for use in the New England Historical and Genealogical Registerpublished by the New England Historic Genealogical Societybased in Boston, Massachusetts. Register Style, of which the numbering system is part, is one of two major styles used in the U.S. for compiling descending genealogies.

  8. ISO 6346 - Wikipedia

    en.wikipedia.org/wiki/ISO_6346

    ISO 6346. ISO 6346 is an international standard covering the coding, identification and marking of intermodal (shipping) containers used within containerized intermodal freight transport by the International Organization for Standardization (ISO). [ 1] The standard establishes a visual identification system for every container that includes a ...

  9. Indian numbering system - Wikipedia

    en.wikipedia.org/wiki/Indian_numbering_system

    The Indian numbering system corresponds to the Western system for the zeroth through fourth powers of ten: one (10 0 ), ten (10 1 ), one hundred (10 2 ), one thousand (10 3 ), and ten thousand (10 4 ). For higher powers of ten, the names no longer correspond. In the ancient Indian system still in use in regional languages of India, there are ...