Geodesic
On Polynomial Algebras and Free Algebras
Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 575-581

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

It is well known that given the polynomial algebra (for definitions, see §2), an algebra of type τ, and a sequence a of elements of , one can define a congruence relation θa of such that the factor algebra is isomorphic to the subalgebra of generated by a, and the isomorphism is given in a very simple way. 
Grätzer, George. On Polynomial Algebras and Free Algebras. Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 575-581. doi: 10.4153/CJM-1968-057-1
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