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  2. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    1/52! chance of a specific shuffle Mathematics: The chances of shuffling a standard 52-card deck in any specific order is around 1.24 × 10 −68 (or exactly 1 ⁄ 52!) [4] Computing: The number 1.4 × 10 −45 is approximately equal to the smallest positive non-zero value that can be represented by a single-precision IEEE floating-point value.

  3. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    [1] [2] [3] The f-number is also known as the focal ratio, f-ratio, or f-stop, and it is key in determining the depth of field, diffraction, and exposure of a photograph. [4] The f-number is dimensionless and is usually expressed using a lower-case hooked f with the format f / N , where N is the f-number.

  4. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

  5. Single-precision floating-point format - Wikipedia

    en.wikipedia.org/wiki/Single-precision_floating...

    Integers between 2 24 =16777216 and 2 25 =33554432 round to a multiple of 2 (even number) Integers between 2 25 and 2 26 round to a multiple of 4... Integers between 2 n and 2 n+1 round to a multiple of 2 n-23... Integers between 2 127 and 2 128 round to a multiple of 2 104; Integers greater than or equal to 2 128 are rounded to "infinity".

  6. Double-precision floating-point format - Wikipedia

    en.wikipedia.org/wiki/Double-precision_floating...

    The 11 bit width of the exponent allows the representation of numbers between 10 −308 and 10 308, ... (1 + 2 −52) ≈ 1.0000000000000002, the smallest number > 1

  7. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The first four partial sums of the series 1 + 2 + 3 + 4 + ⋯.The parabola is their smoothed asymptote; its y-intercept is −1/12. [1]The infinite series whose terms ...

  8. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Unit fractions can also be expressed using negative exponents, as in 2 −1, which represents 1/2, and 2 −2, which represents 1/(2 2) or 1/4. A dyadic fraction is a common fraction in which the denominator is a power of two, e.g. ⁠ 1 / 8 ⁠ = ⁠ 1 / 2 3 ⁠. In Unicode, precomposed fraction characters are in the Number Forms block.

  9. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    The customary system is offset by 1 ⁄ 4 barleycorn, or 1 ⁄ 12 in (2.12 mm), comparing to the UK sizes. The men's range starts at size 1, with zero point corresponding to the children's size 13 which equals 24 + 3 ⁄ 4 barleycorns or 8 + 1 ⁄ 4 inches (20.96 cm). However, most US manufacturers are using greater offsets, such as 1 ⁄ 2 and ...