first category

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first category

[′fərst ′kad·ə‚gȯr·ē]
(mathematics)
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.
References in periodicals archive ?
She said: "People will be wondering why it is taking Labour so long to come up with such a meagre set of proposals.