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  2. Heaviside cover-up method - Wikipedia

    en.wikipedia.org/wiki/Heaviside_cover-up_method

    When a partial fraction term has a single (i.e. unrepeated) binomial in the denominator, the numerator is a residue of the function defined by the input fraction. We calculate each respective numerator by (1) taking the root of the denominator (i.e. the value of x that makes the denominator zero) and (2) then substituting this root into the ...

  3. Integration by parts - Wikipedia

    en.wikipedia.org/wiki/Integration_by_parts

    This visualization also explains why integration by parts may help find the integral of an inverse function f−1 (x) when the integral of the function f (x) is known. Indeed, the functions x (y) and y (x) are inverses, and the integral ∫ x dy may be calculated as above from knowing the integral ∫ y dx.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics, most notably in Euclid's Elements. [4] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions ), until the 16th and 17th centuries, when algebra [ a ...

  5. Dying To Be Free - The Huffington Post

    projects.huffingtonpost.com/projects/dying-to-be...

    New York City had 420 heroin overdose deaths in 2013 — the most in a decade. A year ago, Vermont’s governor devoted his entire State of the State speech to heroin’s resurgence. The public began paying attention the following month, when Philip Seymour Hoffman died from an overdose of heroin and other drugs.

  6. Infinite product - Wikipedia

    en.wikipedia.org/wiki/Infinite_product

    Infinite product. In mathematics, for a sequence of complex numbers a1, a2, a3, ... the infinite product. is defined to be the limit of the partial products a1a2... an as n increases without bound. The product is said to converge when the limit exists and is not zero. Otherwise the product is said to diverge.

  7. Summation by parts - Wikipedia

    en.wikipedia.org/wiki/Summation_by_parts

    A summation-by-parts (SBP) finite difference operator conventionally consists of a centered difference interior scheme and specific boundary stencils that mimics behaviors of the corresponding integration-by-parts formulation. [3][4] The boundary conditions are usually imposed by the Simultaneous-Approximation-Term (SAT) technique. [5] The ...

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