Algebras whose principal congruences form a sublattice of the congruence lattice.
(English).Czechoslovak Mathematical Journal,
vol. 38
(1988),
issue 4,
pp. 585-588
[1] Baker K. A.: Primitive satisfaction and equational problems for lattices and other algebras. Trans. Amer. Math. Soc. 190 (1974), 125-150. DOI 10.1090/S0002-9947-1974-0349532-4 | MR 0349532