On the joins of semigroup varieties with the variety of commutative semigroups

On the joins of semigroup varieties with the variety of commutative semigroups
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by M. V. Sapir and M. V. Volkov PDF

Proc. Amer. Math. Soc. 120 (1994), 345-348 Request permission

We show that the join of a variety of semigroups and the variety of all commutative semigroups is not finitely based, provided some weak conditions.

References

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On the join of the variety of all bands and the variety of all commutative semigroups via conditional rewrite rules

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