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Some problems of mathematical physics and analysis can be formulated as the problem of solving the equation f € 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 € 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.

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Chapter 1. The Regularization Method

Abstract
1. Let H, F, and G be Hilbert spaces, and let $$\text{A: H} \to \text{F , L: H} \to \text{G}$$ be linear operators, with domains $$\text{D}_{\text{A}}$$ and $$\text{D}_{\text{L}}$$, respectively. We assume that the set $$\text{D}_{\text{A}} \cap \text{D}_{\text{L}} = :\text{D}_{\text{AL}} \ne \emptyset$$ and that a non-empty set $$\text{D} \subseteq \text{D}_{\text{AL}}$$ is given a priori.
V. A. Morozov

Without Abstract
V. A. Morozov

Without Abstract
V. A. Morozov

Without Abstract
V. A. Morozov

Without Abstract
V. A. Morozov

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