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  2. Integration by parts - Wikipedia

    en.wikipedia.org/wiki/Integration_by_parts

    Integration by parts is a heuristic rather than a purely mechanical process for solving integrals; given a single function to integrate, the typical strategy is to carefully separate this single function into a product of two functions u(x)v(x) such that the residual integral from the integration by parts formula is easier to evaluate than the ...

  3. Integration by parts operator - Wikipedia

    en.wikipedia.org/wiki/Integration_by_parts_operator

    Integration by parts operator. In mathematics, an integration by parts operator is a linear operator used to formulate integration by parts formulae; the most interesting examples of integration by parts operators occur in infinite-dimensional settings and find uses in stochastic analysis and its applications.

  4. Wallis' integrals - Wikipedia

    en.wikipedia.org/wiki/Wallis'_integrals

    Wallis's integrals can be evaluated by using Euler integrals: Euler integral of the first kind: the Beta function: for Re (x), Re (y) > 0. Euler integral of the second kind: the Gamma function: for Re (z) > 0. If we make the following substitution inside the Beta function: we obtain:

  5. Summation by parts - Wikipedia

    en.wikipedia.org/wiki/Summation_by_parts

    Summation by parts. In mathematics, summation by parts transforms the summation of products of sequences into other summations, often simplifying the computation or (especially) estimation of certain types of sums. It is also called Abel's lemma or Abel transformation, named after Niels Henrik Abel who introduced it in 1826.

  6. Integration by substitution - Wikipedia

    en.wikipedia.org/wiki/Integration_by_substitution

    Calculus. In calculus, integration by substitution, also known as u-substitution, reverse chain rule or change of variables, [1] is a method for evaluating integrals and antiderivatives. It is the counterpart to the chain rule for differentiation, and can loosely be thought of as using the chain rule "backwards."

  7. Adjoint equation - Wikipedia

    en.wikipedia.org/wiki/Adjoint_equation

    Adjoint equation. An adjoint equation is a linear differential equation, usually derived from its primal equation using integration by parts. Gradient values with respect to a particular quantity of interest can be efficiently calculated by solving the adjoint equation. Methods based on solution of adjoint equations are used in wing shape ...

  8. Symmetry of second derivatives - Wikipedia

    en.wikipedia.org/wiki/Symmetry_of_second_derivatives

    Symmetry of second derivatives. In mathematics, the symmetry of second derivatives (also called the equality of mixed partials) is the fact that exchanging the order of partial derivatives of a multivariate function. does not change the result if some continuity conditions are satisfied (see below); that is, the second-order partial derivatives ...

  9. Integral of secant cubed - Wikipedia

    en.wikipedia.org/wiki/Integral_of_secant_cubed

    The integral of secant cubed is a frequent and challenging [1] indefinite integral of elementary calculus: where is the inverse Gudermannian function, the integral of the secant function. There are a number of reasons why this particular antiderivative is worthy of special attention: The technique used for reducing integrals of higher odd ...

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