By Howard Becker
A Polish area (group) is a separable, thoroughly metrizable topological area (group). This booklet is set activities of Polish teams, in connection with--or from the viewpoint of--the topic of descriptive set idea. Descriptive set conception is the research of definable units and services in Polish areas. the fundamental periods of definable units are the periods of Borel, analytic and coanalytic units, and those represent the most subject of the ebook, however the authors additionally ponder different sessions of definable units. this can be a precious booklet for all researchers in set conception and similar parts.
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