uniformity; regularity; permutability; coherence; transferable congruences; Mal'cev condition
An algebra $a$ is uniform if for each $\theta\in\Con a$, every two classes of $\theta$ have the same cardinality. It was shown by W. Taylor that coherent varieties need not be uniform (and vice versa). We show that every coherent variety having transferable congruences is uniform.
 Chаjdа I.: Transferable principal congruences and regular algebras
. Math. Slovaca З4 (1984), 97-102. MR 0735940
 Chаjdа I.: Examples of local uniformity of congruences
. Acta Sci. Math. (Szeged) 52 (1988), 81-84. MR 0957790
 Chаjdа I: Weak coherence of congruences
. Czechoslovak Math. J. 41 (1991), 149-154. MR 1087635
 Geiger D.: Coherent algebras. Notices Amer. Math. Soc. 21 (1974), 74T-A130.
 Krаuss P. H., Clаrk D. M.: Global subdirect products
. Mem. Amer. Math. Soc. 210 (1979). MR 0512475
 Thurston H. A.: Derived operations and congruences
. Proc. London Math. Soc. 8 (1958), 127-134. MR 0091924
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