Detail príspevku/publikácie

Abstrakt

The author examines and explicates the intuitive concept of the knowledge a set. He points to the problems of set specification by means of empirical conditions or by means of expressions, of which the referent is world-dependent. Attention is paid also to the Russellian concept of acquaintance with a set. The last part of the paper shows various explications of the concept of the knowledge a set, corresponding to different levels of the effectivness of conditions (in Kleene-Mostowski Hierarchy), by means of which the sets are specified.