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47A55 Perturbation theory (21 articles)

• Souilah, Khalid: Generalized quadratic operators and perturbations. (English). Mathematica Bohemica, vol. 147 (2022), issue 1, pp. 51-63
• Carpintero, Carlos; Gutiérrez, Alexander; Rosas, Ennis; Sanabria, José: A note on preservation of spectra for two given operators. (English). Mathematica Bohemica, vol. 145 (2020), issue 2, pp. 113-126
• Berkani, Mohammed; Sarih, Mustapha; Zariouh, Hassan: A-Browder-type theorems for direct sums of operators. (English). Mathematica Bohemica, vol. 141 (2016), issue 1, pp. 99-108
• Awawdeh, Fadi; Obiedat, Hamed M.: Identification problems for degenerate parabolic equations. (English). Applications of Mathematics, vol. 58 (2013), issue 4, pp. 389-404
• Amouch, M.; Zguitti, H.: B-Fredholm and Drazin invertible operators through localized SVEP. (English). Mathematica Bohemica, vol. 136 (2011), issue 1, pp. 39-49
• Barnes, Bruce A.: Linear inessential operators and generalized inverses. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 50 (2009), issue 1, pp. 75-82
• Berkani, M.; Castro, N.; Djordjević, S. V.: Single valued extension property and generalized Weyl’s theorem. (English). Mathematica Bohemica, vol. 131 (2006), issue 1, pp. 29-38
• Berkani, M.; Medková, D.: A note on the index of $B$-Fredholm operators. (English). Mathematica Bohemica, vol. 129 (2004), issue 2, pp. 177-180
• 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
• Ibrahim, Sobhy El-sayed: On $L^2_w$-quasi-derivatives for solutions of perturbed general quasi-differential equations. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 4, pp. 877-890
• Martinón, Antonio: Operational quantities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 38 (1997), issue 3, pp. 471-484
• Regińska, Teresa: Convergence of approximation methods for eigenvalue problem for two forms. (English). Aplikace matematiky, vol. 29 (1984), issue 5, pp. 333-341
• Voldřich, Josef: The ranges of nonlinear operators of the polynomial type. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 4, pp. 671-684
• Tarafdar, Enayat: On the existence of solution of the equation $L(x) = N(x)$ and a generalized coincidence degree theory. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 1, pp. 37-58
• Tarafdar, Enayat: On the existence of solution of the equation $L(x) = N(x)$ and a generalized coincidence degree theory. I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 4, pp. 805-823
• Nassif, N.; Descloux, J.; Rappaz, J.: On properties of spectral approximations. (English). In: Fábera, Jiří (ed.): Equadiff IV. Czechoslovak Conference on Differential Equations and Their Applications. Proceedings, Prague, August 22-26, 1977. Springer-Verlag, Berlin, 1979. pp. [81]-85
• Marek, I.: Fredholm points of compactly pertubed bounded linear operators. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 17 (1976), issue 1, pp. 65-72
• Marek, I.: Fredholm points of compactly perturbed bounded linear operators. (English). In: Novák, Josef (ed.): General topology and its relations to modern analysis and algebra IV, Proceedings of the fourth Prague topological symposium, 1976. Part B: Contributed Papers. Society of Czechoslovak Mathematicians and Physicist, Praha, 1977. pp. [268]-275
• Riedl, H. M.; Webb, Glenn F.: Relative boundedness conditions and the perturbation of nonlinear operators. (English). Czechoslovak Mathematical Journal, vol. 24 (1974), issue 4, pp. 584-597
• Sova, Miroslav: Abstract semilinear equations with small parameter. (English). In: Ráb, Miloš and Vosmanský, Jaromír (eds.): Proceedings of Equadiff III. 3rd Czechoslovak Conference on Differential Equations and Their Applications. Brno, Czechoslovakia, August 28 - September 1, 1972. Univ. J. E. Purkyně - Přírodovědecká fakulta, Brno, 1973. pp. 71-79
• Marek, Ivo: Relaxation lengths and nonnegative solutions in neutron transport. (English). In: Ráb, Miloš and Vosmanský, Jaromír (eds.): Proceedings of Equadiff III. 3rd Czechoslovak Conference on Differential Equations and Their Applications. Brno, Czechoslovakia, August 28 - September 1, 1972. Univ. J. E. Purkyně - Přírodovědecká fakulta, Brno, 1973. pp. 227-234