open set

English

Noun

open set (plural open sets)

1. (topology) Informally, a set such that the target point of a movement by a small amount in any direction from any point in the set is still in the set; exemplified by a full circle without its boundary.
2. (topology, mathematical analysis, restricted to metric spaces) A set which can be described as an (arbitrary) union of open balls. Equivalently, a set such that for every point in it, there is an open ball centered at that point, such that that open ball is contained by the set.
3. (topology) Most generally, a member of the topology of a given topological space.

Meronyms

• (in metric spaces): open ball

Holonyms

• topology
• topological space

Derived terms

• distinguished open set

Related terms

• closed set

Translations

the set of all interior points

• Chinese:

  Mandarin: 開集／开集 (zh) (kāijí)

• Dutch: open verzameling f
• Finnish: avoin joukko
• French: ouvert (fr) m, ensemble ouvert m
• German: offene Menge f
• Greek: ανοικτό σύνολο n (anoiktó sýnolo)
• Hebrew: קבוצה פתוחה (he) f (kvutzá ptukhá)
• Japanese: 開集合 (ja) (かいしゅうごう, kaishūgō)
• Macedonian: отворено множество n (otvoreno množestvo)
• Polish: zbiór otwarty m
• Russian: откры́тое мно́жество n (otkrýtoje mnóžestvo)
• Swedish: öppen mängd c

Anagrams

• Speeton, openest, pentose, pontees, posteen, poteens