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34L05 General spectral theory (11 articles)

• Yao, Siqin; Sun, Jiong; Zettl, Anton: The Sturm-Liouville Friedrichs extension. (English). Applications of Mathematics, vol. 60 (2015), issue 3, pp. 299-320
• Labovskiy, Sergey; Getimane, Mário Frengue: On discreteness of spectrum of a functional differential operator. (English). Mathematica Bohemica, vol. 139 (2014), issue 2, pp. 213-229
• Hilscher, Roman Šimon; Zemánek, Petr: Friedrichs extension of operators defined by linear Hamiltonian systems on unbounded interval. (English). Mathematica Bohemica, vol. 135 (2010), issue 2, pp. 209-222
• Davidson, F. A.; Dodds, N.: Properties of eigenfunctions of non-local operators. (English). In: Fila, Marek, Handlovičová, A., Mikula, K., Medveď, Milan, Quittner, Pavol and Ševčovič, Daniel (eds.): Proceedings of Equadiff 11, International Conference on Differential Equations. Czecho-Slovak series, Bratislava, July 25-29, 2005. [Part 2] Minisymposia and contributed talks. Comenius University Press, Bratislava, 2007. pp. 57-66
• Ibrahim, Sobhy El-sayed: The spectra of general differential operators in the direct sum spaces. (English). Czechoslovak Mathematical Journal, vol. 54 (2004), issue 1, pp. 9-29
• Tunca, Gülen Başcanbaz; Bairamov, Elgiz: Discrete spectrum and principal functions of non-selfadjoint differential operator. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 4, pp. 689-700
• Brown, R. C.; Hinton, D. B.: Two separation criteria for second order ordinary or partial differential operators. (English). Mathematica Bohemica, vol. 124 (1999), issue 2, pp. 273-292
• Lazhari, M. N.: Paley-Wiener theorems for the Schrodinger operator on $\Bbb R$. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 39 (1998), issue 2, pp. 227-235
• Došlý, Ondřej; Hilscher, Roman: Spectral properties of fourth order differential operators. (English). Mathematica Bohemica, vol. 122 (1997), issue 2, pp. 153-168
• Došlý, Ondřej: Generalized reciprocity for self-adjoint linear differential equations. (English). Archivum Mathematicum, vol. 31 (1995), issue 2, pp. 85-96
• Coddington, E. A.: Formally normal ordinary differential operators. (English). In: Šeda, Valter (ed.): Differential Equations and Their Applications. Proceedings of the Conference held in Bratislava in September 1966. Slovenské pedagogické nakladateľstvo, Bratislava, 1967. pp. 65-72