Editing Injective hull (section)

{{Short description|Notion in abstract algebra}}{{About|the injective hull of a module in algebra|injective hulls of metric spaces, also called tight spans, injective envelopes, or hyperconvex hulls|tight span}}
In [[mathematics]], particularly in [[abstract algebra|algebra]], the '''injective hull''' (or '''injective envelope''') of a [[module (mathematics)|module]] is both the smallest [[injective module]] containing it and the largest [[essential extension]] of it.  Injective hulls were first described in {{harv|Eckmann|Schopf|1953}}.