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  2. Wallis' integrals - Wikipedia

    en.wikipedia.org/wiki/Wallis'_integrals

    The sequence () is decreasing and has positive terms. In fact, for all : >, because it is an integral of a non-negative continuous function which is not identically zero; + = ⁡ + ⁡ = (⁡) (⁡) >, again because the last integral is of a non-negative continuous function.

  3. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    Formula Year Set One: 1 1 Multiplicative identity ... Wallis's constant ... where Li(t) is the logarithmic integral, ...

  4. Double factorial - Wikipedia

    en.wikipedia.org/wiki/Double_factorial

    The generalized formula ... This approximation gets more accurate as n increases, which can be seen as a result of the Wallis Integral. Generalizations

  5. Wallis product - Wikipedia

    en.wikipedia.org/wiki/Wallis_product

    John Wallis, English mathematician who is given partial credit for the development of infinitesimal calculus and pi. Viète's formula, a different infinite product formula for . Leibniz formula for π, an infinite sum that can be converted into an infinite Euler product for π. Wallis sieve

  6. List of formulae involving π - Wikipedia

    en.wikipedia.org/wiki/List_of_formulae_involving_π

    More formulas of this nature can be given, as explained by Ramanujan's theory of elliptic functions to alternative bases. Perhaps the most notable hypergeometric inversions are the following two examples, involving the Ramanujan tau function τ {\displaystyle \tau } and the Fourier coefficients j {\displaystyle \mathrm {j} } of the J-invariant ...

  7. Category:Integrals - Wikipedia

    en.wikipedia.org/wiki/Category:Integrals

    Lobachevsky integral formula; A. Area under the curve (pharmacokinetics) B. Borwein integral; C. Cauchy principal value; ... Wallis' integrals This page was ...

  8. Stirling's approximation - Wikipedia

    en.wikipedia.org/wiki/Stirling's_approximation

    A complex-analysis version of this method [4] is to consider ! as a Taylor coefficient of the exponential function = =!, computed by Cauchy's integral formula as ! = | | = +. This line integral can then be approximated using the saddle-point method with an appropriate choice of contour radius r = r n {\displaystyle r=r_{n}} .

  9. List of integrals of exponential functions - Wikipedia

    en.wikipedia.org/wiki/List_of_integrals_of...

    Toyesh Prakash Sharma, Etisha Sharma, "Putting Forward Another Generalization Of The Class Of Exponential Integrals And Their Applications.," International Journal of Scientific Research in Mathematical and Statistical Sciences, Vol.10, Issue.2, pp.1-8, 2023.