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Lower density operators. Φf versus Φd

Ivanova Gertruda, Wagner-Bojakowska Elżbieta, Wilczyński Władysław

Opuscula Mathematica

2023

Vol. 43, no. 2

185--197

Using the new method of the construction of lower density operator introduced in the earlier paper of the first two authors, we study how much the new operator can be different from the classical one. The aim of this paper is to show that if f is a good adjusted measure-preserving bijection then the lower density operator generated by f can be really different from the classical density operator.