Unitary Boundary Pairs for Isometric Operators in Pontryagin Spaces and Generalized Coresolvents
Unitary Boundary Pairs for Isometric Operators in Pontryagin Spaces and Generalized Coresolvents
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庞特里亚金空间和广义核心溶剂中等距算子的酉边界对
DOI:
10.1007/s11785-020-01073-4
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发表时间:
2021
影响因子:
0.8
通讯作者:
S. Hassi
中科院分区:
文献类型:
--
作者:
D. Baidiuk;V. Derkach;S. Hassi
An isometric operatorVin a Pontryagin spaceis called standard, if its domain and the range are nondegenerate subspaces in. A description of coresolvents for standard isometric operators is known and basic underlying concepts that appear in the literature are unitary colligations and characteristic functions. In the present paper generalized coresolvents of non-standard Pontryagin space isometric operators are described. The methods used in this paper rely on a new general notion of boundary pairs introduced for isometric operators in a Pontryagin space setting. Even in the Hilbert space case this notion generalizes the earlier concept of boundary triples for isometric operators and offers an alternative approach to study operator valued Schur functions without any additional invertibility requirements appearing in the ordinary boundary triple approach.
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DOI:
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发表时间:
2006
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影响因子:
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作者:
V. Derkach;S. Hassi;M. Malamud;H. Snoo
通讯作者:
H. Snoo
DOI:
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发表时间:
1971
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影响因子:
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作者:
G. Langer
通讯作者:
G. Langer
DOI:
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发表时间:
2011
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影响因子:
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作者:
J. Behrndt;V. Derkach;S. Hassi;H. Snoo
通讯作者:
H. Snoo
DOI:
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发表时间:
1999
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影响因子:
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作者:
V. Derkach
通讯作者:
V. Derkach
DOI:
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发表时间:
1972
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影响因子:
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作者:
B. Szőkefalvi
通讯作者:
B. Szőkefalvi