It is shown formally how transmutation kernels can be characterized via a minimizing procedure. The technique then can be extended to more general operators and transmutations.

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This calculation suggests (as is indeed the case) that the characterization of K0 by minimization does not require the trace argument [i.e., the last integral in (2.3)];
the details will appear elsewhere.
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© 1984 American Institute of Physics.
1984
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