Compressed Resolvents and Reduction of Spectral Problems on Star Graphs
Compressed Resolvents and Reduction of Spectral Problems on Star Graphs
复制标题
星图谱问题的压缩求解和简化
DOI:
10.1007/s11785-018-0793-6
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发表时间:
2018
影响因子:
0.8
通讯作者:
Brown B
中科院分区:
文献类型:
--
作者:
Brown B
In this paper a two-step reduction method for spectral problems on a star graph withedgesand a self-adjoint matching condition at the central vertexvis established. The first step is a reduction to the problem on the single edgebut with an energy depending boundary condition atv. In the second step, by means of an abstract inverse result forQ-functions, a reduction to a problem on a path graph with two edges,joined by continuity and Kirchhoff conditions is given. All results are proved for symmetric linear relations in an orthogonal sum of Hilbert spaces. This ensures wide applicability to various different realizations, in particular, to canonical systems and Krein strings which include, as special cases, Dirac systems and Stieltjes strings. Employing two other key inverse results by de Branges and Krein, we answer e.g. the following question: If all differential operators are of one type, when can the reduced system be chosen to consist of two differential operators of the same type?
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影响因子:
2
作者:
Batu Güneysu;Matthias Keller;Marcel Schmidt
通讯作者:
Marcel Schmidt
影响因子:
--
作者:
V. Vasil’ev;S. Piskarev
通讯作者:
V. Vasil’ev;S. Piskarev
影响因子:
0.8
作者:
S. Simonov;H. Woracek
通讯作者:
H. Woracek
影响因子:
1
作者:
H. Langer;W. Schenk
通讯作者:
W. Schenk
DOI:
10.1007/978-3-642-23840-6
发表时间:
2012
期刊:
Annales Henri Poincaré
影响因子:
--
作者:
O. Post
通讯作者:
O. Post