Essential spectra of singular matrix dif
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Jiangang Qi; Shaozhu Chen
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Article
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2010
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John Wiley and Sons
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English
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## Abstract The present paper is concerned with the essential spectrum of the singular matrix differential operator of mixed order over the interval (__a__, __b__), where __D__ = __d__/__dt__. It is shown that if the coefficients are locally integrable functions and __T__ is in the limit circle ca