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Almost open map — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Almost_open_map
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-08T16:40:20.038Z
SHA-256 of the archived text: 87f235fc39c60e57a3473524a7052a9e7e2a5e2de6e072add1c977aae481451b
Stable URL of this page: https://metraipolis.com/documento/dc_ebbd2b1fb3ef

How to cite

Almost open map — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Almost_open_map (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_ebbd2b1fb3ef (Metraipolis archive dc_ebbd2b1fb3ef, sha256 87f235fc39c60e57a3473524a7052a9e7e2a5e2de6e072add1c977aae481451b)

BibTeX

@misc{dcebbd2b1fb3ef,
  title = {Almost open map — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Almost_open_map},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_ebbd2b1fb3ef; sha256 87f235fc39c60e57a3473524a7052a9e7e2a5e2de6e072add1c977aae481451b},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Almost_open_map. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In functional analysis and related areas of mathematics, an almost open map between topological spaces is a map that satisfies a condition similar to, but weaker than, the condition of being an open map. As described below, for certain broad categories of topological vector spaces, all surjective linear operators are necessarily almost open.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Almost open map» — https://en.wikipedia.org/wiki/Almost_open_map
Wikidata Q105806667 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q105806667
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Almost_open_map?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1322449767, consultata il 2026-11-08T16:36:16.345Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: cf8c515481ca6352089932c508b8e04dc279c21421b2e35d811389534eb18960