regular open

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English[edit]

Etymology[edit]

From regular + open; apparently a backformation from regular open set.

Adjective[edit]

regular open (not comparable)

  1. (rare, mathematics, of a set) Being the interior of its closure.
    The set (0,1)∪(1,2) is open, but is not regular open, because its closure is [0,2], so the interior of its closure is (0,2).

See also[edit]

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