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  2. Image sensor format - Wikipedia

    en.wikipedia.org/wiki/Image_sensor_format

    For example, 1/2.5 converts to 2/5 as a simple fraction, or 0.4 as a decimal number. This "inch" system gives a result approximately 1.5 times the length of the diagonal of the sensor. This "inch" system gives a result approximately 1.5 times the length of the diagonal of the sensor.

  3. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.

  4. List of countries by income equality - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    This is a list of countries or dependencies by income inequality metrics, including Gini coefficients.The Gini coefficient is a number between 0 and 1, where 0 corresponds with perfect equality (where everyone has the same income) and 1 corresponds with perfect inequality (where one person has all the income—and everyone else has no income).

  5. UEFA coefficient - Wikipedia

    en.wikipedia.org/wiki/UEFA_coefficient

    The number of points awarded each season is divided by the number of teams that participated for that association in that season. ... 1.875 0.250 16.000 4/4 30: 31 +1 ...

  6. ISO 31-0 - Wikipedia

    en.wikipedia.org/wiki/ISO_31-0

    ISO 31-0. ISO 31-0 is the introductory part of international standard ISO 31 on quantities and units. It provides guidelines for using physical quantities, quantity and unit symbols, and coherent unit systems, especially the SI. It was intended for use in all fields of science and technology and is augmented by more specialized conventions ...

  7. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    The primes of the form 2n+1 are the odd primes, including all primes other than 2. Some sequences have alternate names: 4n+1 are Pythagorean primes, 4n+3 are the integer Gaussian primes, and 6n+5 are the Eisenstein primes (with 2 omitted). The classes 10n+d (d = 1, 3, 7, 9) are primes ending in the decimal digit d.

  8. Orders of magnitude (length) - Wikipedia

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

    The centimetre ( SI symbol: cm) is a unit of length in the metric system equal to 102 metres ( ⁠1100⁠m = 0.01 m ). To help compare different orders of magnitude, this section lists lengths between 102 m and 101 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.

  9. 31 (number) - Wikipedia

    en.wikipedia.org/wiki/31_(number)

    31 is the number of regular polygons with an odd number of sides that are known to be constructible with compass and straightedge, from combinations of known Fermat primes of the form 2 2n + 1 (they are 3, 5, 17, 257 and 65537 ). [11] [12] 31 is a centered pentagonal number. Only two numbers have a sum-of-divisors equal to 31: 16 (1 + 2 + 4 + 8 ...