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groupoid; variety; nonfinitely based

References:

[1] S. Crvenković and J. Dudek: **Rectangular groupoids**. Czech. Math. J. 35 (1985), 405–414. MR 0803035

[2] J. A. Gerhard: **The lattice of equational classes of idempotent semigroups**. J. Algebra 15 (1970), 195–224. DOI 10.1016/0021-8693(70)90073-6 | MR 0263953 | Zbl 0194.02701

[3] E. Jacobs and R. Schwabauer: **The lattice of equational classes of algebras with one unary operation**. Ann. of Math. 71 (1964), 151–155. MR 0162740

[4] J. Ježek: **Slim groupoids**. (to appear). MR 2357590

[5] R. McKenzie, G. McNulty and W. Taylor: **Algebras, Lattices, Varieties, Volume I**. Wadsworth & Brooks/Cole, Monterey, CA, 1987. MR 0883644