** Next:** The Spitz estimate
** Up:** Guitton: Preconditioning and Hessian
** Previous:** Discussion

Nemeth (1996) shows that the Hessians in equations ()
can be unstable if the signal and noise operators and predict similar components of the data space.
In this section I show that the Spitz estimate of the signal
PEF makes this overlap impossible.

Stanford Exploration Project

6/7/2002