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  2. A Course of Modern Analysis - Wikipedia

    en.wikipedia.org/wiki/A_Course_of_Modern_Analysis

    Title page for the third edition of the book. A Course of Modern Analysis: an introduction to the general theory of infinite processes and of analytic functions; with an account of the principal transcendental functions (colloquially known as Whittaker and Watson) is a landmark textbook on mathematical analysis written by Edmund T. Whittaker and George N. Watson, first published by Cambridge ...

  3. Function (mathematics) - Wikipedia

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

    In mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. [1] The set X is called the domain of the function [2] and the set Y is called the codomain of the function. [3] Functions were originally the idealization of how a varying quantity depends on another quantity.

  4. Mathematical analysis - Wikipedia

    en.wikipedia.org/wiki/Mathematical_analysis

    Complex Analysis: An Introduction to the Theory of Analytic Functions of One Complex Variable, by Lars Ahlfors [54] Complex Analysis, by Elias Stein [55] Functional Analysis: Introduction to Further Topics in Analysis, by Elias Stein [56] Analysis (2 volumes), by Terence Tao [57] [58] Analysis (3 volumes), by Herbert Amann, Joachim Escher [59 ...

  5. Functional analysis - Wikipedia

    en.wikipedia.org/wiki/Functional_analysis

    These modes are eigenfunctions of a linear operator on a function space, a common construction in functional analysis. Functional analysis is a branch of mathematical analysis , the core of which is formed by the study of vector spaces endowed with some kind of limit-related structure (for example, inner product , norm , or topology ) and the ...

  6. Function theory - Wikipedia

    en.wikipedia.org/wiki/Function_theory

    Function theory may refer to: Theory of functions of a real variable, the traditional name of real analysis , a branch of mathematical analysis dealing with the real numbers and real-valued functions of a real variable

  7. Calculus of variations - Wikipedia

    en.wikipedia.org/wiki/Calculus_of_Variations

    Functions that maximize or minimize functionals may be found using the Euler–Lagrange equation of the calculus of variations. A simple example of such a problem is to find the curve of shortest length connecting two points. If there are no constraints, the solution is a straight line between the points. However, if the curve is constrained to ...

  8. Generalized function - Wikipedia

    en.wikipedia.org/wiki/Generalized_function

    This fixes all products of generalized functions as shown by H. Kleinert and A. Chervyakov. [5] The result is equivalent to what can be derived from dimensional regularization. [6] Several constructions of algebras of generalized functions have been proposed, among others those by Yu. M. Shirokov [7] and those by E. Rosinger, Y. Egorov, and R ...

  9. Arithmetic function - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_function

    An average order of an arithmetic function is some simpler or better-understood function which has the same summation function asymptotically, and hence takes the same values "on average". We say that g is an average order of f if ∑ n ≤ x f ( n ) ∼ ∑ n ≤ x g ( n ) {\displaystyle \sum _{n\leq x}f(n)\sim \sum _{n\leq x}g(n)}

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