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groupoid; variety; nonfinitely based

References:

[1] T. Evans: **Embeddability and the word problem**. J. London Math. Soc. 28 (1953), 76–80. MR 0053915 | Zbl 0050.02801

[2] R. McKenzie: **Tarski’s finite basis problem is undecidable**. Int. J. Algebra and Computation 6 (1996), 49–104. DOI 10.1142/S0218196796000040 | MR 1371734 | Zbl 0844.08011

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