## Geophysical Inverse Theory |

In many physical sciences, the most natural description of a system is with a function of position or time. In principle, infinitely many numbers are needed to specify that function, but in practice only finitely many measurements can be made. Inverse theory concerns the mathematical techniques that enable researchers to use the available information to build a model of the unknown system or to determine its essential properties. In Parker's approach is to avoid artificial statistical constructs and to emphasize instead the reasonable assumptions researchers must make to reduce the ambiguity that inevitably arises in complex problems. The structure of the book follows a natural division in the subject into linear theory, in which the measured quantities are linear functionals of the unknown models, and nonlinear theory, which covers all other systems but is not nearly so well understood. The book covers model selection as well as techniques for drawing firm conclusions about the earth independent of any particular model. "This is [a] very good value for [the] money.... The book describes forefront techniques which will be of use to established researchers, and yet, by its very style, the book is highly accessible to beginners. I heartily recommend it, not only to geophysicists, but to any scientist who is concerned with state-of-the art methods of interpreting his or her data."
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