regular open

形容词 adj.
中文释义

英文释义

形容词 adj.
  1. Being the interior of its closure. not-comparable,rare
    — 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).

词源

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