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The Tamarkin equiconvergence theorem and a first-order trace formula for regular differential operators revisited

The Tamarkin equiconvergence theorem and a first-order trace formula for regular differential operators revisited

We obtain a simple formula for the first-order trace of a regular differential operator on a segment perturbated by a multiplication operator. The main analytic ingredient of the proof is an improvement of the Tamarkin equiconvergence theorem.