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We have shown how to define simple linear *operators* as simple
*objects* with initialization attributes and generic operator
interfaces. The tools we have used for this task are Fortran 90 *
modules* and function *interfaces*. The next step is to combine
elementary operators into chains and blocks, creating more
sophisticated composite operators, and to pass those operators to
universal linear *estimators* for estimating the solutions of
geophysical inverse problems.

Stanford Exploration Project

11/11/1997