en open ball
― PartOf ⟶
Weight: 1.0
en open set (n) Source: English Wiktionary
en open set (n)
― PartOf ⟶
Weight: 1.0
en topological space Source: English Wiktionary
en open set (n)
― PartOf ⟶
Weight: 1.0
en topology Source: English Wiktionary