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)
- (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).