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  2. Least common multiple - Wikipedia

    en.wikipedia.org/wiki/Least_common_multiple

    A multiple of a number is the product of that number and an integer. For example, 10 is a multiple of 5 because 5 × 2 = 10, so 10 is divisible by 5 and 2. Because 10 is the smallest positive integer that is divisible by both 5 and 2, it is the least common multiple of 5 and 2.

  3. Euclidean algorithm - Wikipedia

    en.wikipedia.org/wiki/Euclidean_algorithm

    Since the recursion formula has been assumed to be correct for r k−2 and r k−1, they may be expressed in terms of the corresponding s and t variables r k = (s k−2 a + t k−2 b) − q k (s k−1 a + t k−1 b). Rearranging this equation yields the recursion formula for step k, as required r k = s k a + t k b = (s k−2 − q k s k−1) a ...

  4. Lowest common denominator - Wikipedia

    en.wikipedia.org/wiki/Lowest_common_denominator

    The lowest common denominator of a set of fractions is the lowest number that is a multiple of all the denominators: their lowest common multiple.The product of the denominators is always a common denominator, as in:

  5. Chinese remainder theorem - Wikipedia

    en.wikipedia.org/wiki/Chinese_remainder_theorem

    In mathematics, the Chinese remainder theorem states that if one knows the remainders of the Euclidean division of an integer n by several integers, then one can determine uniquely the remainder of the division of n by the product of these integers, under the condition that the divisors are pairwise coprime (no two divisors share a common factor other than 1).

  6. Feynman parametrization - Wikipedia

    en.wikipedia.org/wiki/Feynman_parametrization

    An alternative form of the parametrization that is sometimes useful is = [+]. This form can be derived using the change of variables = / ().We can use the product rule to show that = / (), then

  7. Cross-multiplication - Wikipedia

    en.wikipedia.org/wiki/Cross-multiplication

    [4] For an equation of the form =, where the variable to be evaluated is in the right-hand denominator, the rule of three states that =. In this context, a is referred to as the extreme of the proportion, and b and c are called the means.

  8. Twelvefold way - Wikipedia

    en.wikipedia.org/wiki/Twelvefold_way

    Two of the problems are trivial (the number of equivalence classes is 0 or 1), five problems have an answer in terms of a multiplicative formula of n and x, and the remaining five problems have an answer in terms of combinatorial functions (Stirling numbers and the partition function for a given number of parts).

  9. Chinese mathematics - Wikipedia

    en.wikipedia.org/wiki/Chinese_mathematics

    A very important recent development for the 4-body problem is that Xue Jinxin and Dolgopyat proved a non-collision singularity in a simplified version of the 4-body system around 2013. [ 75 ] In addition, in 2007, Shen Weixiao and Kozlovski, Van-Strien proved the Real Fatou conjecture : Real hyperbolic polynomials are dense in the space of real ...