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<p>problem approach we, roughly speaking, try to know the causes given the effects.</p>

<p><big>General statement of the inverse problem</big></p>
<p>The inverse problem is the "inverse" of the forward problem: instead of determining the data produced by particular model parameters, we want to determine the model parameters that produce the data  that is the observation we have recorded (the subscript <b>obs</b> stands for observed).Our goal, in other words, is to determine the model parameters  such that (at least approximately)</p>

<p>where  is the forward</p><p>
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