On equivalence and linearization of operator matrix functions with unbounded entries

Engström, Christian; Torshage, Johan Axel (2017). On equivalence and linearization of operator matrix functions with unbounded entries. Integral equations and operator theory, 89(4), pp. 465-492. Birkhäuser 10.1007/s00020-017-2415-5

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In this paper we present equivalence results for several types of unbounded operator functions. A generalization of the concept equivalence after extension is introduced and used to prove equivalence and linearization for classes of unbounded operator functions. Further, we deduce methods of finding equivalences to operator matrix functions that utilizes equivalences of the entries. Finally, a method of finding equivalences and linearizations to a general case of operator matrix polynomials is presented.

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