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math.FA2020
Unitary boundary pairs for isometric operators in Pontryagin spaces and generalized coresolvents
D. Baidiuk, V. Derkach, S. Hassi
An isometric operator V in a Pontryagin space H is called standard, if its domain and the range are nondegenerate subspaces in H. A description of coresolvents for standard isometr…
math.AP2020
Robustness of polynomial stability of damped wave equations
D. Baidiuk, L. Paunonen
In this paper we present new results on the preservation of polynomial stability of damped wave equations under addition of perturbing terms. We in particular introduce sufficient…