Geodesic
Retracts and Injectives
Canadian mathematical bulletin, Tome 25 (1982) no. 4, pp. 462-467

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Embedding theorems are employed to show that many important categories do not possess non-trivial retracts or injectives. E.g., the categories of monoids, groups, rings, rings with unity, polynomial identity rings, nilpotent groups, solvable groups, and several varieties of groups.
DOI : 10.4153/CMB-1982-066-9
Mots-clés : 18G05 
Feigelstock, Shalom; Klein, Aaron. Retracts and Injectives. Canadian mathematical bulletin, Tome 25 (1982) no. 4, pp. 462-467. doi: 10.4153/CMB-1982-066-9
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     title = {Retracts and {Injectives}},
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     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-066-9/}
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