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  2. Greatest common divisor - Wikipedia

    en.wikipedia.org/wiki/Greatest_common_divisor

    The greatest common divisor (GCD) of integers a and b, at least one of which is nonzero, is the greatest positive integer d such that d is a divisor of both a and b; that is, there are integers e and f such that a = de and b = df, and d is the largest such integer.

  3. Euclidean algorithm - Wikipedia

    en.wikipedia.org/wiki/Euclidean_algorithm

    For illustration, the probability of a quotient of 1, 2, 3, or 4 is roughly 41.5%, 17.0%, 9.3%, and 5.9%, respectively. Since the operation of subtraction is faster than division, particularly for large numbers, [ 115 ] the subtraction-based Euclid's algorithm is competitive with the division-based version. [ 116 ]

  4. 1,1,1,2,3,3,3-Heptafluoropropane - Wikipedia

    en.wikipedia.org/wiki/1,1,1,2,3,3,3...

    1,1,1,2,3,3,3-Heptafluoropropane, also called heptafluoropropane, HFC-227ea (ISO name), HFC-227 or FM-200, as well as apaflurane , is a colourless, odourless gaseous halocarbon commonly used as a gaseous fire suppression agent.

  5. Gaussian integer - Wikipedia

    en.wikipedia.org/wiki/Gaussian_integer

    Similarly, cubic reciprocity relates the solvability of x 3 ≡ q (mod p) to that of x 3 ≡ p (mod q), and biquadratic (or quartic) reciprocity is a relation between x 4 ≡ q (mod p) and x 4 ≡ p (mod q). Gauss discovered that the law of biquadratic reciprocity and its supplements were more easily stated and proved as statements about "whole ...

  6. Least common multiple - Wikipedia

    en.wikipedia.org/wiki/Least_common_multiple

    Here, the composite number 90 is made up of one atom of the prime number 2, two atoms of the prime number 3, and one atom of the prime number 5. This fact can be used to find the lcm of a set of numbers. Example: lcm(8,9,21) Factor each number and express it as a product of prime number powers.

  7. Halt and Catch Fire (computing) - Wikipedia

    en.wikipedia.org/wiki/Halt_and_Catch_Fire...

    The Motorola 6800 microprocessor was the first for which an undocumented assembly mnemonic HCF became widely known. The operation codes (opcodes—the portions of the machine language instructions that specify an operation to be performed) hexadecimal 9D and DD were reported and given the unofficial mnemonic HCF in a December 1977 article by Gerry Wheeler in BYTE magazine on undocumented ...

  8. Coprime integers - Wikipedia

    en.wikipedia.org/wiki/Coprime_integers

    The numbers 8 and 9 are coprime, despite the fact that neither—considered individually—is a prime number, since 1 is their only common divisor. On the other hand, 6 and 9 are not coprime, because they are both divisible by 3. The numerator and denominator of a reduced fraction are coprime, by definition.

  9. Three-point estimation - Wikipedia

    en.wikipedia.org/wiki/Three-point_estimation

    The 99.7% confidence interval for the true project work time is approximately E(project) ± 3 × SD(project) Information Systems typically uses the 95% confidence interval for all project and task estimates. [2] These confidence interval estimates assume that the data from all of the tasks combine to be approximately normal (see asymptotic ...