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most citedD-Branes in Orientifolds and Orbifolds and Kasparov KK-Theory

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math.FA2019

The numerical range of a class of periodic tridiagonal operators

Benjamín A. Itzá-Ortiz, Rubén A. Martínez-Avendaño

In this paper we compute the closure of the numerical range of certain periodic tridiagonal operators. This is achieved by showing that the closure of the numerical range of such o…