From Wikipedia, the free encyclopedia
Iður eða innmengi er mengi allra staka tiltekins mengis S sem ekki tilheyra jaðri mengisins, táknað með Int(S), int(S) eða So. Er skv. skilgreiningu opið mengi. Sammengi iðurs og jaðars mengis nefnist lokun mengis.
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.