Geodesic
SOLVABILITY OF EQUATIONS IN VARIETIES OF UNIVERSAL ALGEBRAS
Acta mathematica Universitatis Comenianae, Tome 62 (1993) no. 2 
B. Csakany; A. A. Iskander. SOLVABILITY OF EQUATIONS IN VARIETIES OF UNIVERSAL ALGEBRAS. Acta mathematica Universitatis Comenianae, Tome 62 (1993) no. 2. http://geodesic.mathdoc.fr/item/AMUC_1993_62_2_a3/
@article{AMUC_1993_62_2_a3,
     author = {B. Csakany and A. A. Iskander},
     title = {SOLVABILITY {OF} {EQUATIONS} {IN} {VARIETIES} {OF} {UNIVERSAL} {ALGEBRAS}},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {1993},
     volume = {62},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/AMUC_1993_62_2_a3/}
}
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Voir la notice de l'article provenant de la source Comenius University

We study classes of universal algebras in a variety that are closed under the formation of Cartesian products, homomorphic images and extensions. We prove a Birkhoff type theorem for such axiomatic classes.