Another characterization of congruence distributive varieties

29 Sep 2019  ·  Lipparini Paolo ·

We provide a Maltsev characterization of congruence distributive varieties by showing that a variety $\mathcal {V}$ is congruence distributive if and only if the congruence identity $\alpha \cap (\beta \circ \gamma \circ \beta ) \subseteq \alpha \beta \circ \gamma \circ \alpha \beta \circ \gamma \dots$ ($k$ factors) holds in $\mathcal {V}$, for some natural number $k$...

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