PERTURBATIONS OF EIGENVALUE PROBLEMS IN ELECTROMAGNETICS
 
            by   H. AMMARI and J.-C. NEDELEC
            
This paper considers the effect of two types of perturbations on
eigenvalue problems for Maxwell's equations in bounded domains.
The first kind occurs in calculating the change in resonant
frequencies of a cavity due to absorbing material on its boundary. 
The second arises in analyzing a cavity containing a small body. 
For each of these perturbations, the resonant frequencies for the
perturbed problem are constructed. In some special cases, the 
asymptotic results are shown to agree well with exact results.

 
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