Geodesic
A Characterization of Modularity forCongruence Lattices of Algebras*
Canadian mathematical bulletin, Tome 12 (1969) no. 2, pp. 167-173

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

Let us call an equational class (variety) K of algebras permutable if and only if every pair of congruences on each K-algebra is permutable. Similarly, we will call K modular (distributive) if the congruence lattice of each K-algebra is modular (distributive). 
Day, Alan. A Characterization of Modularity forCongruence Lattices of Algebras*. Canadian mathematical bulletin, Tome 12 (1969) no. 2, pp. 167-173. doi: 10.4153/CMB-1969-016-6
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