# ill-posed problem

## ill-posed problem

[′il ¦pōzd ′präb·ləm]
(mathematics)
A problem which may have more than one solution, or in which the solutions depend discontinuously upon the initial data. Also known as improperly posed problem.
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It is well known that the backward heat conduction problem is a severely ill-posed problem. To show the influence of the final time values [T.sub.1] and [T.sub.2] on the numerical inversion results, we solve the inverse problem in Examples 1 and 2 by our proposed method with different large final time values and fixed values n = 200, m = 20, and [delta] = 0.10.
Following , as a severely ill-posed problem we will understand the equation (1.1) for which a kernel of A is much smoother than the solution of (1.1).
As mentioned above, this problem is coupled by a severely ill-posed problem and a mildly ill-posed one.
The continuation problem is ill-posed problem; its solution is unique, but it does not depend continuously on the Cauchy data [1-10].
Stanculescu, Iuliana, University of Pittsburgh, Turbulence modeling as an ill-posed problem.
This is an ill-posed problem, and there are several difficulties connected with the solution of these problems (1,2).
Therefore the backward identification problem is an ill-posed problem.
It is obvious that for this highly ill-posed problem the OGSDA is convergent fast, and accurate.
The exponentially ill-posed operator yields under the assumption of a particularly smooth exact solution a moderately ill-posed problem. Therefore, it appears to be impossible to infer the smoothness of both the operator and solution from a given convergence rate without a priori knowledge of the type of smoothness of these objects.
In the second example, we discuss an ill-posed problem where the condition number of linear operator A is 255; we aim to demonstrate that the proposed method is stable even with large condition numbers.
In addition, as we know, for ill-posed problem, the regularization parameter a plays an important role and hence has to be chosen appropriately.

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