Brahim, Fatma Ben; Jeribi, Aref; Krichen, Bilel Spectral theory for polynomially demicompact operators. (English) Zbl 1496.47023 Filomat 33, No. 7, 2017-2030 (2019). MSC: 47A53 47A55 47A10 PDFBibTeX XMLCite \textit{F. B. Brahim} et al., Filomat 33, No. 7, 2017--2030 (2019; Zbl 1496.47023) Full Text: DOI
Karmouni, M.; Tajmouati, A.; El Bakkali, A. Upper triangular operator matrices and limit points of the essential spectrum. (English) Zbl 07216103 Proyecciones 38, No. 3, 401-409 (2019). MSC: 47A10 47A11 PDFBibTeX XMLCite \textit{M. Karmouni} et al., Proyecciones 38, No. 3, 401--409 (2019; Zbl 07216103) Full Text: DOI
Khaldi, Nassima; Messirdi, Bekkai Stability of essential spectra of closed operators under \(T\)-compact equivalence. (English) Zbl 1438.47025 Bull. Transilv. Univ. Brașov, Ser. III, Math. Inform. Phys. 12(61), No. 1, 53-64 (2019). MSC: 47A53 47A55 47N50 PDFBibTeX XMLCite \textit{N. Khaldi} and \textit{B. Messirdi}, Bull. Transilv. Univ. Brașov, Ser. III, Math. Inform. Phys. 12(61), No. 1, 53--64 (2019; Zbl 1438.47025) Full Text: DOI
Ershov, Yu. L.; Schwidefsky, M. V. To the spectral theory of partially ordered sets. (English. Russian original) Zbl 1481.06008 Sib. Math. J. 60, No. 3, 450-463 (2019); translation from Sib. Mat. Zh. 60, No. 3, 578-598 (2019). MSC: 06A07 06B30 54B35 PDFBibTeX XMLCite \textit{Yu. L. Ershov} and \textit{M. V. Schwidefsky}, Sib. Math. J. 60, No. 3, 450--463 (2019; Zbl 1481.06008); translation from Sib. Mat. Zh. 60, No. 3, 578--598 (2019) Full Text: DOI
Belghith, Marwa; Moalla, Nedra; Walha, Ines On the essential spectra of unbounded operator matrices with non diagonal domain and an application. (English) Zbl 1448.47009 Oper. Matrices 13, No. 1, 231-251 (2019). MSC: 47A08 47A53 34K08 PDFBibTeX XMLCite \textit{M. Belghith} et al., Oper. Matrices 13, No. 1, 231--251 (2019; Zbl 1448.47009) Full Text: DOI
Jeribi, Aref; Krichen, Bilel; Zitouni, Ali Spectral properties for \(\gamma \)-diagonally dominant operator matrices using demicompactness classes and applications. (English) Zbl 07092250 Rev. R. Acad. Cienc. Exactas Fís. Nat., Ser. A Mat., RACSAM 113, No. 3, 2391-2406 (2019). MSC: 47A55 47A53 47H08 PDFBibTeX XMLCite \textit{A. Jeribi} et al., Rev. R. Acad. Cienc. Exactas Fís. Nat., Ser. A Mat., RACSAM 113, No. 3, 2391--2406 (2019; Zbl 07092250) Full Text: DOI
Gül, Uǧur; Koca, Beyaz Başak Fredholm criteria in a \(C^{\ast}\)-algebra acting on the Hardy space of the bi-disc with applications to composition operators. (English) Zbl 07087187 J. Math. Anal. Appl. 477, No. 1, 163-173 (2019). MSC: 47-XX 30-XX PDFBibTeX XMLCite \textit{U. Gül} and \textit{B. B. Koca}, J. Math. Anal. Appl. 477, No. 1, 163--173 (2019; Zbl 07087187) Full Text: DOI
Nazarov, S. A. Asymptotics of the eigenvalues and eigenfunctions of a thin square Dirichlet lattice with a curved ligament. (English. Russian original) Zbl 1419.35144 Math. Notes 105, No. 4, 559-579 (2019); translation from Mat. Zametki 105, No. 4, 564-588 (2019). Reviewer: Michael Perelmuter (Kyïv) MSC: 35P20 35J25 78A50 81Q37 PDFBibTeX XMLCite \textit{S. A. Nazarov}, Math. Notes 105, No. 4, 559--579 (2019; Zbl 1419.35144); translation from Mat. Zametki 105, No. 4, 564--588 (2019) Full Text: DOI