A natural normalization makes the Evans function magnitude a lower bound on spectral distance, so non-zero values certify a disk in the resolvent set.
Instability of local deformations of an elastic rod: numerical evaluation of the Evans function.SIAM Journal on Applied Mathematics, 71(5):1653– 1672
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The Evans function as a lower bound on the spectral distance function
A natural normalization makes the Evans function magnitude a lower bound on spectral distance, so non-zero values certify a disk in the resolvent set.