Geodesic
A New Construction of the Injective Hull
Canadian mathematical bulletin, Tome 11 (1968) no. 1, pp. 19-21

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The definition of injectivity, and the proof that every module has an injective extension which is a subextension of every other injective extension, are due to R. Baer [B]. An independent proof using the notion of essential extension was given by Eckmann-Schopf [ES]. Both proofs require the p reliminary construction of some injective overmodule. In [F] I showed how the latter proof could be freed from this requirement by exhibiting a set F in which every essential extension could be embedded. Subsequently J. M. Maranda pointed out that F has minimal cardinality. It follows that F is equipotent with the injective hull. Below Icon struct the injective hull by equipping Fit self with a module strucure. 
Fleischer, Isidore. A New Construction of the Injective Hull. Canadian mathematical bulletin, Tome 11 (1968) no. 1, pp. 19-21. doi: 10.4153/CMB-1968-002-3
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