first category(redirected from Meagre set)
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first category[′fərst ′kad·ə‚gȯr·ē]
A set is of first category if it is a countable union of nowhere dense sets.
A set S is of first category at a point x if there is a neighborhood of x whose intersection with S is of first category.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.