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regular G_δ set

Last-modified: 2010-09-27 (月) 02:29:30

Definition Edit

A subset H of a space X is called a regular G_δ set if H is an intersection of a sequence of closed sets whose interiors contain H. The complement of a regular G_δset is called a regular F_σ set.

Reference Edit

J. K. Hohli and D. Singh, Between compactness and quasicompactness, Acta. Math. Hungar. 106 (4) (2005), 317-329.