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    The Gamma Function
    The Gamma Function
    The Gamma Function
    Ebook62 pages36 minutes

    The Gamma Function

    By Emil Artin and michael butler

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    About this ebook

    This brief monograph on the gamma function was designed by the author to fill what he perceived as a gap in the literature of mathematics, which often treated the gamma function in a manner he described as both sketchy and overly complicated. Author Emil Artin, one of the twentieth century's leading mathematicians, wrote in his Preface to this book, "I feel that this monograph will help to show that the gamma function can be thought of as one of the elementary functions, and that all of its basic properties can be established using elementary methods of the calculus."
    Generations of teachers and students have benefitted from Artin's masterly arguments and precise results. Suitable for advanced undergraduates and graduate students of mathematics, his treatment examines functions, the Euler integrals and the Gauss formula, large values of x and the multiplication formula, the connection with sin x, applications to definite integrals, and other subjects.
    LanguageEnglish
    PublisherDover Publications
    Release dateJan 28, 2015
    ISBN9780486803005
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      Book preview

      The Gamma Function - Emil Artin

      Index

      [ 1 ]

      Convex Functions

      Let f(x) be a real-valued function defined on an open interval a < x < b of the real line. For each pair x1, x2 of distinct numbers in the interval we form the difference quotient

      and for each triple of distinct numbers x1, x2, x3 the quotient

      The value of the function Ψ(x1, x2, x3) does not change when the arguments x1, x2, x3 are permuted.

      f(x) is called convex (on the interval (a, b)) if, for every number x3 of our interval, φ(x1, x3) is a monotonically increasing function of x1. This means, of course, that for any pair of numbers x1 > x2 distinct from x. Since the value of Ψ is not changed by permuting the arguments, the convexity of f(x) is equivalent to the

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