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In mathematics, Hadamard regularization (also called Hadamard finite part or Hadamard's partie finie) is a method of regularizing divergent integrals by dropping some divergent terms and keeping the finite part, introduced by Hadamard (1923, book III, chapter I, 1932). Riesz (1938, 1949) showed that this can be interpreted as taking the meromorphic continuation of a convergent integral.
exists, then it may be differentiated with respect to x to obtain the Hadamard finite part integral as follows:
Note that the symbols and are used here to denote Cauchy principal value and Hadamard finite-part integrals respectively.
The Hadamard finite part integral above (for a < x < b) may also be given by the following equivalent definitions:
The definitions above may be derived by assuming that the function f (t) is differentiable infinitely many times at t = x for a < x < b, that is, by assuming that f (t) can be represented by its Taylor series about t = x. For details, see Ang (2013). (Note that the term − f (x)/2(1/b − x − 1/a − x) in the second equivalent definition above is missing in Ang (2013) but this is corrected in the errata sheet of the book.)
Integral equations containing Hadamard finite part integrals (with f (t) unknown) are termed hypersingular integral equations. Hypersingular integral equations arise in the formulation of many problems in mechanics, such as in fracture analysis.
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Chap 2: Hadamard & Picard Conditions, Singular Value Expansion, Naive Reconstruction - 1
Chap 2: Hadamard & Picard Conditions, Singular Value Expansion, Naive Reconstruction - 2
Chap 2: Hadamard & Picard Conditions, Singular Value Expansion, Naive Reconstruction - 3
Hadamard, J. (1932), Le problème de Cauchy et les équations aux dérivées partielles linéaires hyperboliques (in French), Paris: Hermann & Cie., p. 542, Zbl0006.20501.