Reflectionless Dirac operators on a finite-gap set are homeomorphic to a product of N probability-measure spaces on circles, with finite-gap operators as the extreme points.
Reflectionless Dirac operators and matrix valued Krein functions
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I prove a sharp bound on reflectionless Dirac operators.
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Reflectionless operators and automorphic Herglotz functions
Reflectionless Dirac operators on a finite-gap set are homeomorphic to a product of N probability-measure spaces on circles, with finite-gap operators as the extreme points.