Editing Injective module (section)

===Injective hulls===
{{Main|injective hull}}
The [[injective hull]] of a module is the smallest injective module containing the given one and was described in {{harv|Eckmann|Schopf|1953}}.

One can use injective hulls to define a minimal injective resolution (see below). If each term of the injective resolution is the injective hull of the cokernel of the previous map, then the injective resolution has minimal length.