Ingrid Rotter is the author or coauthor of 51 papers listed among
the references attached to these compact 50 pages of her topical
review text devoted to physics of open quantum systems. As a
top-quality specialist in nuclear physics she found a fortunate
unifying idea of her rather sketchy account of numerous aspects of
these systems in the well known Feshbach's trick which characterizes
the operators of quantum observables (mainly, Hamiltonians) in terms
of their projections from the full Hilbert space to a certain
suitable subspace (here, mainly, excluding a spatially remote
``environment"). Globally, her text should be perceived as a quick,
deeply intuitive guide or map of the extensive terrain of various
openness-related phenomena investigated by many physicists, mainly,
during the last cca ten years. In the section of Acknowledgements
she herself thanks, after all, to as many as 23 of her coauthors or
collaborators or discussion partners contacted during this period of
time. Only too many topics are touched to be listed here -- let us
just mention their sampling by the 14 reproductions of Figures, all
of which were taken from her own older publications devoted to
various concrete toy models. Thus, the readers should actually be
advised to turn their attention also to the original, more detailed
papers whenever they happen to feel addressed and/or interested.

MR2539256 Rotter, Ingrid: A non-Hermitian Hamilton operator and the
physics of open quantum systems. J. Phys. A 42 (2009), no. 15,
153001, 51 pp. 81Qxx