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  2. Euler's totient function - Wikipedia

    en.wikipedia.org/wiki/Euler's_totient_function

    The first thousand values of φ(n).The points on the top line represent φ(p) when p is a prime number, which is p − 1. [1]In number theory, Euler's totient function counts the positive integers up to a given integer n that are relatively prime to n.

  3. Quotient group - Wikipedia

    en.wikipedia.org/wiki/Quotient_group

    Indeed, if is not closed then the quotient space is not a T1-space (since there is a coset in the quotient which cannot be separated from the identity by an open set), and thus not a Hausdorff space. For a non-normal Lie subgroup ⁠ N {\displaystyle N} ⁠ , the space G / N {\displaystyle G\,/\,N} of left cosets is not a group, but simply a ...

  4. Quotient rule - Wikipedia

    en.wikipedia.org/wiki/Quotient_rule

    In calculus, the quotient rule is a method of finding the derivative of a function that is the ratio of two differentiable functions. Let () = (), where both f and g are differentiable and () The quotient rule states that the derivative of h(x) is

  5. Identity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Identity_(mathematics)

    Visual proof of the Pythagorean identity: for any angle , the point (,) = (⁡, ⁡) lies on the unit circle, which satisfies the equation + =.Thus, ⁡ + ⁡ =. In mathematics, an identity is an equality relating one mathematical expression A to another mathematical expression B, such that A and B (which might contain some variables) produce the same value for all values of the variables ...

  6. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Exploits the identity that the quotient of two variables plus (or minus) one times the divisor equals their sum (or difference): (+) = +, =. This is similar to the addition/subtraction technique used for high-speed electronic circuits with a logarithmic number system in specialized computer applications like the Gravity Pipe (GRAPE ...

  7. List of logarithmic identities - Wikipedia

    en.wikipedia.org/wiki/List_of_logarithmic_identities

    The identities of logarithms can be used to approximate large numbers. Note that log b ( a ) + log b ( c ) = log b ( ac ) , where a , b , and c are arbitrary constants. Suppose that one wants to approximate the 44th Mersenne prime , 2 32,582,657 −1 .

  8. Multiplicative group of integers modulo n - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_group_of...

    It is denoted / or / (the notation refers to taking the quotient of integers modulo the ideal or () consisting of the multiples of n). Outside of number theory the simpler notation Z n {\displaystyle \mathbb {Z} _{n}} is often used, though it can be confused with the p -adic integers when n is a prime number.

  9. Polynomial identity testing - Wikipedia

    en.wikipedia.org/wiki/Polynomial_identity_testing

    In mathematics, polynomial identity testing (PIT) is the problem of efficiently determining whether two multivariate polynomials are identical. More formally, a PIT algorithm is given an arithmetic circuit that computes a polynomial p in a field , and decides whether p is the zero polynomial.