Infinite-time exact observability of Volterra systems in Hilbert spaces

2019 ◽  
Vol 126 ◽  
pp. 28-32 ◽  
Author(s):  
Jian-Hua Chen

2021 ◽  
Vol 59 (2) ◽  
pp. 1275-1292
Author(s):  
Jian-Hua Chen ◽  
Nian-yu Yi


2008 ◽  
Vol 57 (3) ◽  
pp. 222-227 ◽  
Author(s):  
Gen Qi Xu ◽  
Chao Liu ◽  
Siu Pang Yung


Author(s):  
Svante Janson
Keyword(s):  


2020 ◽  
Vol Accepted ◽  
Author(s):  
Oluwatosin Temitope Mewomo ◽  
Hammed Anuoluwapo Abass ◽  
Chinedu Izuchukwu ◽  
Olawale Kazeem Oyewole




Author(s):  
D. E. Edmunds ◽  
W. D. Evans

This chapter is concerned with closable and closed operators in Hilbert spaces, especially with the special classes of symmetric, J-symmetric, accretive and sectorial operators. The Stone–von Neumann theory of extensions of symmetric operators is treated as a special case of results for compatible adjoint pairs of closed operators. Also discussed in detail is the stability of closedness and self-adjointness under perturbations. The abstract results are applied to operators defined by second-order differential expressions, and Sims’ generalization of the Weyl limit-point, limit-circle characterization for symmetric expressions to J-symmetric expressions is proved.



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