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regular open. In DICTIOUS you will not only get to know all the dictionary meanings for the word
regular open, but we will also tell you about its etymology, its characteristics and you will know how to say
regular open in singular and plural. Everything you need to know about the word
regular open you have here. The definition of the word
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English
Etymology
From regular + open; apparently a backformation from regular open set.
Adjective
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).
See also