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Displaying similar documents to “Existence of solutions for equations involving iterated functional series.”

The spectra of general differential operators in the direct sum spaces

Sobhy El-sayed Ibrahim (2004)

Czechoslovak Mathematical Journal

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In this paper, the general ordinary quasi-differential expression M p of n -th order with complex coefficients and its formal adjoint M p + on any finite number of intervals I p = ( a p , b p ) , p = 1 , , N , are considered in the setting of the direct sums of L w p 2 ( a p , b p ) -spaces of functions defined on each of the separate intervals, and a number of results concerning the location of the point spectra and the regularity fields of general differential operators generated by such expressions are obtained. Some of these are extensions...