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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    For example, in base 10, the factors of 10 1 include 2, 5, and 10. Therefore, divisibility by 2, 5, and 10 only depend on whether the last 1 digit is divisible by those divisors. The factors of 10 2 include 4 and 25, and divisibility by those only depend on the last 2 digits. Case where only the last digit(s) are removed

  3. Frequency divider - Wikipedia

    en.wikipedia.org/wiki/Frequency_divider

    Divide by 2, and asynchronous 2 N Ripple Counter dividers - Electronics Tutorials; Synchronous divide by 3, 6, 9, 12 with 50% duty cycle output - ON Semiconductor; Synchronous divide by 3 or 5 with 50% duty cycle output, and divide by 1.5 & 2.5 circuits - Xilinx; Divide by N-0.5 using 74x161 counters - Whitepaper

  4. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    where μ is the expected value of the random variables, σ equals their distribution's standard deviation divided by n 12, and n is the number of random variables. The standard deviation therefore is simply a scaling variable that adjusts how broad the curve will be, though it also appears in the normalizing constant .

  5. Division by two - Wikipedia

    en.wikipedia.org/wiki/Division_by_two

    An orange that has been sliced into two halves. In mathematics, division by two or halving has also been called mediation or dimidiation. [1] The treatment of this as a different operation from multiplication and division by other numbers goes back to the ancient Egyptians, whose multiplication algorithm used division by two as one of its fundamental steps. [2]

  6. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or ⁠ ⁠, where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include ⁠ 1 2 ⁠, − ⁠ 8 5 ⁠, ⁠ −8 5 ⁠, and ⁠ 8 −5 ⁠.

  7. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    f-number. Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one. An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is calculated by dividing the system's focal length by the diameter of the ...

  8. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    Fractions are written as two integers, the numerator and the denominator, with a dividing bar between them. The fraction ⁠ m / n ⁠ represents m parts of a whole divided into n equal parts. Two different fractions may correspond to the same rational number; for example ⁠ 1 / 2 ⁠ and ⁠ 2 / 4 ⁠ are equal, that is:

  9. 2.5GBASE-T and 5GBASE-T - Wikipedia

    en.wikipedia.org/wiki/2.5GBASE-T_and_5GBASE-T

    The resulting standards are named 2.5GBASE-T and 5GBASE-T. [1][2][3] NBASE-T refers to Ethernet equipment that supports speeds of at least 2.5 Gbit/s and sometimes 5 or 10 Gbit/s, and that can automatically use training to operate at the best speed supported by the cable quality. [4] Usually it also supports additional link speeds (10, 100 or ...