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Published February 1996 | Published
Journal Article Open

Inertia properties of indefinite quadratic forms

Abstract

We study the relation between the solutions of two estimation problems with indefinite quadratic forms. We show that a complete link between both solutions can be established by invoking a fundamental set of inertia conditions. While these inertia conditions are automatically satisfied in a standard Hilbert space setting, they nevertheless turn out to mark the differences between the two estimation problems in indefinite metric spaces. They also include, as special cases, the well-known conditions for the existence of H-infinity-filters and controlers.

Additional Information

© 1996 IEEE. Reprinted with permission. Manuscript received September 5, 1994. This work was supported by a Research Initiation Award from the National Science Foundation under Award MIP-9409319 and by the Army Research Office under Contract DAAL03-89-K-0109. The associate editor coordinating the review of this letter and approvmg it for publicatlon was Dr. T. S. Durrani.

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