TY  - JOUR
AU  - Juršėnas, R.
TI  - Weyl families of transformed boundary pairs
JF  - MATHEMATISCHE NACHRICHTEN
J2  - MATH NACHR
PY  - 2023
SN  - 0025-584X
DO  - 10.1002/mana.202100262
UR  - https://m2.mtmt.hu/api/publication/33941821
ID  - 33941821
N1  - Export Date: 1 June 2023            
            Correspondence Address: Juršėnas, R.; Institute of Theoretical Physics and Astronomy, Saulėtekio ave. 3, Lithuania; email: rytis.jursenas@tfai.vu.lt
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Sebestyén, Zoltán
AU  - Tarcsay, Zsigmond
TI  - Extensions of positive symmetric operators and Krein's uniqueness criteria
JF  - LINEAR AND MULTILINEAR ALGEBRA
J2  - LINEAR MULTILINEAR A
PY  - 2023
SN  - 0308-1087
DO  - 10.1080/03081087.2023.2196610
UR  - https://m2.mtmt.hu/api/publication/33766588
ID  - 33766588
N1  - Export Date: 11 September 2023            
            Correspondence Address: Tarcsay, Z.; Department of Applied Analysis and Computational Mathematics, Pázmány Péter sétány 1/c, Hungary; email: zsigmond.tarcsay@ttk.elte.hu
LA  - English
DB  - MTMT
ER  - 

TY  - GEN
AU  - R., Jursenas
TI  - WEYL FAMILIES OF TRANSFORMED BOUNDARY PAIRS
PY  - 2021
UR  - https://m2.mtmt.hu/api/publication/32087197
ID  - 32087197
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Roman, Marcel
AU  - Sandovici, Adrian
TI  - Adjoint to each other linear relations. Nieminen type criteria
JF  - MONATSHEFTE FUR MATHEMATIK
J2  - MONATSH MATH
PY  - 2021
SN  - 0026-9255
DO  - 10.1007/s00605-021-01579-9
UR  - https://m2.mtmt.hu/api/publication/32083562
ID  - 32083562
N1  - Export Date: 7 September 2022            
            Correspondence Address: Sandovici, A.; Department of Mathematics and Informatics, B-dul Carol I, nr. 11, Romania; email: adrian.sandovici@luminis.ro
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Tarcsay, Zsigmond
AU  - Sebestyén, Zoltán
TI  - Canonical Graph Contractions of Linear Relations on Hilbert Spaces
JF  - COMPLEX ANALYSIS AND OPERATOR THEORY
J2  - COMPLEX ANAL OPER TH
VL  - 15
PY  - 2021
IS  - 1
SN  - 1661-8254
DO  - 10.1007/s11785-020-01066-3
UR  - https://m2.mtmt.hu/api/publication/31840162
ID  - 31840162
N1  - Export Date: 7 September 2022            
            Correspondence Address: Tarcsay, Z.; Department of Applied Analysis and Computational Mathematics, Pázmány Péter sétány 1/c, Hungary; email: tarcsay@cs.elte.hu
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Hassi, Seppo
AU  - Labrousse, Jean-Philippe
AU  - de Snoo, Henk
TI  - Operational calculus for rows, columns, and blocks of linear relations
JF  - ADVANCES IN OPERATOR THEORY
J2  - ADV OPERAT THEORY
VL  - 5
PY  - 2020
IS  - 3
SP  - 1193
EP  - 1228
PG  - 36
SN  - 2538-225X
DO  - 10.1007/s43036-020-00085-3
UR  - https://m2.mtmt.hu/api/publication/31488892
ID  - 31488892
N1  - Cited By :2            
            Export Date: 7 September 2022            
            Correspondence Address: de Snoo, H.; Bernoulli Institute for Mathematics, P.O. Box 407, Netherlands; email: hsvdesnoo@gmail.com
AB  - Columns and rows are operations for pairs of linear relations in Hilbert spaces, modelled on the corresponding notions of the componentwise sum and the usual sum of such pairs. The introduction of matrices whose entries are linear relations between underlying component spaces takes place via the row and column operations. The main purpose here is to offer an attempt to formalize the operational calculus for block matrices, whose entries are all linear relations. Each block relation generates a unique linear relation between the Cartesian products of initial and final Hilbert spaces that admits particular properties which will be characterized. Special attention is paid to the formal matrix multiplication of two blocks of linear relations and the connection to the usual product of the unique linear relations generated by them. In the present general setting these two products need not be connected to each other without some additional conditions.
LA  - English
DB  - MTMT
ER  -