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Paper detail

Trace formula for contractions and it's representation in $\mathbb{D}$

The aim of this article is twofold: give a short proof of the existence of real spectral shift function and the associated trace formula for a pair of contractions, the difference of which is trace-class and one of the two a strict contraction, so that the set of assumptions is minimal in comparison to those in all the existing proofs. The second one is to find a trace formula for differences of functions of contraction and its adjoint, in which case, the integral in the formula is over the unit disc and has an expression surprisingly similar to the Helton-Howe formula.

preprint2021arXivOpen access
Arup ChattopadhyayKalyan B. Sinha
math.FA
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Arup ChattopadhyayKalyan B. Sinha

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