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Gap metric — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Gap_metric
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T18:21:46.575Z
SHA-256 of the archived text: 5d614be4c0bed3674e82d85db0e97ca0c3fd0d516df5b01197f9e87f012e075a
Stable URL of this page: https://metraipolis.com/documento/dc_7e56009dd94d

How to cite

Gap metric — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Gap_metric (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_7e56009dd94d (Metraipolis archive dc_7e56009dd94d, sha256 5d614be4c0bed3674e82d85db0e97ca0c3fd0d516df5b01197f9e87f012e075a)

BibTeX

@misc{dc7e56009dd94d,
  title = {Gap metric — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Gap_metric},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_7e56009dd94d; sha256 5d614be4c0bed3674e82d85db0e97ca0c3fd0d516df5b01197f9e87f012e075a},
  year = {2026}
}

Archived text

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

The gap metric is a mathematical concept used to quantify the distance between linear operators on a Hilbert space. It was introduced independently by Mark Krein and Mark Krasnoselsky (1947), and Béla Szőkefalvi-Nagy (1946), in their work on invertibility of differential operators. The gap metric has since found applications in perturbation theory, robust control, and feedback system analysis.

Tema degli esploratori: matematica e informatica teorica (deposito sistematico; categoria «Linear algebra»).
Fonte: Wikipedia in inglese, voce «Gap metric» — https://en.wikipedia.org/wiki/Gap_metric
Wikidata Q137377077 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q137377077
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Gap_metric?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 1337884076, consultata il 2026-10-07T17:52:12.134Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 404e2a5920112b115508b88d89c4c3071c0ea24f516ac306be655aaf4fdd4601