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A secondary theme of this book
is to develop in the reader an understanding
of a universal linkage beween forward modeling and data processing.
Thus the codes here that incarnate linear operators
are written in a style
that also incarnates the adjoint (conjugate-transpose) operator
thus enabling both modeling and data processing
with the same code.
This style of coding,
besides being concise and avoiding redundancy,
ensures the consistency required for estimation
by conjugate-gradient optimization as described in my other books.
Adjoint operators link the modeling activity to the
model estimation activity.
While this linkage
is less sophisticated than formal estimation theory (``inversion''),
it is robust, easily available,
and does not put unrealistic demands on the data
or imponderable demands on the interpreter.

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Stanford Exploration Project

12/26/2000