Geodesic
An Epi-Reflector for Universal Theories
Canadian mathematical bulletin, Tome 16 (1973) no. 2, pp. 167-171

Voir la notice de l'article provenant de la source Cambridge University Press

A construction of an epi-reflector by injective hull techniques is given which applies to the class of models of any universal theory with the Amalgamation Property and there yields a weak but functorial type of algebraic closure. Various completions such as the boolean envelope and quotient field constructions are identified as such injective hulls over epimorphic injections. Forms of the Amalgamation Property are also shown to eliminate various pathologies of epimorphisms and equalizers. 
Bacsich, Paul D. An Epi-Reflector for Universal Theories. Canadian mathematical bulletin, Tome 16 (1973) no. 2, pp. 167-171. doi: 10.4153/CMB-1973-030-7
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