Methods for Solving Incorrectly Posed Problems (Paperback)
  • Methods for Solving Incorrectly Posed Problems (Paperback)
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Methods for Solving Incorrectly Posed Problems (Paperback)

(author), (editor), (translator)
£79.99
Paperback 257 Pages / Published: 20/11/1984
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Some problems of mathematical physics and analysis can be formulated as the problem of solving the equation f EURO F, (1) Au = f, where A: DA C U + F is an operator with a non-empty domain of definition D , in a metric space U, with range in a metric space F. The metrics A on U and F will be denoted by P and P ' respectively. Relative u F to the twin spaces U and F, J. Hadamard P-06] gave the following defini- tion of correctness: the problem (1) is said to be well-posed (correct, properly posed) if the following conditions are satisfied: (1) The range of the value Q of the operator A coincides with A F ("sol vabi li ty" condition); (2) The equality AU = AU for any u ,u EURO DA implies the I 2 l 2 equality u = u ("uniqueness" condition); l 2 (3) The inverse operator A-I is continuous on F ("stability" condition). Any reasonable mathematical formulation of a physical problem requires that conditions (1)-(3) be satisfied. That is why Hadamard postulated that any "ill-posed" (improperly posed) problem, that is to say, one which does not satisfy conditions (1)-(3), is non-physical. Hadamard also gave the now classical example of an ill-posed problem, namely, the Cauchy problem for the Laplace equation.

Publisher: Springer-Verlag New York Inc.
ISBN: 9780387960593
Number of pages: 257
Weight: 428 g
Dimensions: 235 x 155 x 14 mm
Edition: Softcover reprint of the original 1st ed. 198

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