Zhang, Shuo; Sun, Huaqing; Yang, Chen Friedrichs extensions of a class of discrete Hamiltonian systems with one singular endpoint. (English) Zbl 07750709 Math. Nachr. 296, No. 9, 4169-4191 (2023). MSC: 47A06 47A20 47A07 PDFBibTeX XMLCite \textit{S. Zhang} et al., Math. Nachr. 296, No. 9, 4169--4191 (2023; Zbl 07750709) Full Text: DOI
Zhu, Li; Sun, Huaqing On essential numerical ranges and essential spectra of Hamiltonian systems with one singular endpoint. (English) Zbl 1496.37056 Linear Algebra Appl. 645, 9-29 (2022). MSC: 37J06 34L05 47A55 47A12 PDFBibTeX XMLCite \textit{L. Zhu} and \textit{H. Sun}, Linear Algebra Appl. 645, 9--29 (2022; Zbl 1496.37056) Full Text: DOI
Sun, Huaqing; Xie, Bing Spectra of a class of non-symmetric operators in Hilbert spaces with applications to singular differential operators. (English) Zbl 1506.47037 Proc. R. Soc. Edinb., Sect. A, Math. 150, No. 4, 1769-1790 (2020). Reviewer: Hubert Kalf (München) MSC: 47B25 34B24 PDFBibTeX XMLCite \textit{H. Sun} and \textit{B. Xie}, Proc. R. Soc. Edinb., Sect. A, Math. 150, No. 4, 1769--1790 (2020; Zbl 1506.47037) Full Text: DOI
Qi, Jiangang; Sun, Huaqing Relatively bounded and relatively compact perturbations for limit circle Hamiltonian systems. (English) Zbl 1418.37101 Integral Equations Oper. Theory 86, No. 3, 359-375 (2016). MSC: 37J40 34L05 PDFBibTeX XMLCite \textit{J. Qi} and \textit{H. Sun}, Integral Equations Oper. Theory 86, No. 3, 359--375 (2016; Zbl 1418.37101) Full Text: DOI
Sun, Huaqing; Kong, Qingkai; Shi, Yuming Essential spectrum of singular discrete linear Hamiltonian systems. (English) Zbl 1353.39008 Math. Nachr. 289, No. 2-3, 343-359 (2016). Reviewer: Petr Zemanek (Brno) MSC: 39A12 47A06 47B39 39A70 34L05 34B20 39A06 PDFBibTeX XMLCite \textit{H. Sun} et al., Math. Nachr. 289, No. 2--3, 343--359 (2016; Zbl 1353.39008) Full Text: DOI
Sun, Huaqing; Shi, Yuming On essential spectra of singular linear Hamiltonian systems. (English) Zbl 1329.47044 Linear Algebra Appl. 469, 204-229 (2015). Reviewer: Adriana Buică (Cluj-Napoca) MSC: 47E05 34L05 34B20 PDFBibTeX XMLCite \textit{H. Sun} and \textit{Y. Shi}, Linear Algebra Appl. 469, 204--229 (2015; Zbl 1329.47044) Full Text: DOI
Sun, Huaqing; Shi, Yuming Spectral properties of singular discrete linear Hamiltonian systems. (English) Zbl 1319.39011 J. Difference Equ. Appl. 20, No. 3, 379-405 (2014). MSC: 39A70 34B20 39A10 PDFBibTeX XMLCite \textit{H. Sun} and \textit{Y. Shi}, J. Difference Equ. Appl. 20, No. 3, 379--405 (2014; Zbl 1319.39011) Full Text: DOI
Sun, Huaqing; Qi, Jiangang Criteria of the three cases for non-self-adjoint singular Sturm-Liouville difference equations. (English) Zbl 1263.39011 J. Difference Equ. Appl. 18, No. 12, 2069-2087 (2012). Reviewer: Roman Šimon Hilscher (Brno) MSC: 39A12 39A10 34B24 34C07 PDFBibTeX XMLCite \textit{H. Sun} and \textit{J. Qi}, J. Difference Equ. Appl. 18, No. 12, 2069--2087 (2012; Zbl 1263.39011) Full Text: DOI
Sun, Huaqing; Qi, Jiangang; Jing, Haibin Classification of non-self-adjoint singular Sturm-Liouville difference equations. (English) Zbl 1228.39006 Appl. Math. Comput. 217, No. 20, 8020-8030 (2011). Reviewer: Sui Sun Cheng (Hsinchu) MSC: 39A12 39A06 39A22 34B24 PDFBibTeX XMLCite \textit{H. Sun} et al., Appl. Math. Comput. 217, No. 20, 8020--8030 (2011; Zbl 1228.39006) Full Text: DOI
Sun, Huaqing; Shi, Yuming Self-adjoint extensions for singular linear Hamiltonian systems. (English) Zbl 1228.47026 Math. Nachr. 284, No. 5-6, 797-814 (2011). Reviewer: Adriana Buică (Cluj-Napoca) MSC: 47B25 47N20 34L40 34B05 PDFBibTeX XMLCite \textit{H. Sun} and \textit{Y. Shi}, Math. Nachr. 284, No. 5--6, 797--814 (2011; Zbl 1228.47026) Full Text: DOI
Shi, Yuming; Sun, Huaqing Self-adjoint extensions for second-order symmetric linear difference equations. (English) Zbl 1210.39004 Linear Algebra Appl. 434, No. 4, 903-930 (2011). Reviewer: Claudio Cuevas (Pernambuco) MSC: 39A12 39A70 39A06 47B15 47B25 PDFBibTeX XMLCite \textit{Y. Shi} and \textit{H. Sun}, Linear Algebra Appl. 434, No. 4, 903--930 (2011; Zbl 1210.39004) Full Text: DOI
Sun, Huaqing; Qi, Jiangang On classification of second-order differential equations with complex coefficients. (English) Zbl 1252.34033 J. Math. Anal. Appl. 372, No. 2, 585-597 (2010). MSC: 34B20 34B24 PDFBibTeX XMLCite \textit{H. Sun} and \textit{J. Qi}, J. Math. Anal. Appl. 372, No. 2, 585--597 (2010; Zbl 1252.34033) Full Text: DOI
Sun, Huaqing; Shi, Yuming Strong limit point criteria for a class of singular discrete linear Hamiltonian systems. (English) Zbl 1132.39014 J. Math. Anal. Appl. 336, No. 1, 224-242 (2007). Reviewer: Martin Rasmussen (Augsburg) MSC: 39A12 37J05 PDFBibTeX XMLCite \textit{H. Sun} and \textit{Y. Shi}, J. Math. Anal. Appl. 336, No. 1, 224--242 (2007; Zbl 1132.39014) Full Text: DOI
Sun, Huaqing; Shi, Yuming Eigenvalues of second-order difference equations with coupled boundary conditions. (English) Zbl 1092.39011 Linear Algebra Appl. 414, No. 1, 361-372 (2006). Reviewer: N. C. Apreutesei (Iaşi) MSC: 39A11 39A12 34L05 PDFBibTeX XMLCite \textit{H. Sun} and \textit{Y. Shi}, Linear Algebra Appl. 414, No. 1, 361--372 (2006; Zbl 1092.39011) Full Text: DOI