M(aabb), a ten-element Rees quotient monoid, generates a variety with uncountably many subvarieties, yielding a new minimal finitely based six-element example.
Semigroup Forum 103, 165–190 (2021)
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Small monoids generating varieties with uncountably many subvarieties
M(aabb), a ten-element Rees quotient monoid, generates a variety with uncountably many subvarieties, yielding a new minimal finitely based six-element example.