Research reports by F.A. Abd El Salam

Here are the reports authored by F.A. Abd El Salam. See the reports of all authors.

Helsinki University of Technology Institute of Mathematics Research Reports A

A539: Aly A. El-Sabbagh, F.A. Abd El Salam, K. El Nagaar; On the spectrum of the symmetric relations for the canonical systems of differential equations in Hilbert space [pdf][ps] abstract: [pdf][ps]; Received 2007-12-18 * Hilbert Spaces, Symmetric Relations, minimal and maximal relations, Weyl-Coefficients, and Canonical Systems of Differential Equations * AMS 47A20 * 9 pages
A538: Aly A. El-Sabbagh, F.A. Abd El Salam, K. El Nagaar; On the existence of the selfadjoint extension of the symmetric relation in Hilbert space [pdf][ps] abstract: [pdf][ps]; Received 2007-12-18 * Symmetric Operator, Symmetric Relation, Hilbert Space, Perturbing Case, Selfadjoint Extensions, Krein Space * AMS 47A20 * 9 pages

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