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Abstract

We are particularly interested in the proper subvarieties of \(\mathcal{N}\) and \(\mathcal{N}^{0}\) that are determined by the equation \(f^{r}x \approx f^{s}x\) for some pair r < s. Thus, for 0 ≤ r < s, we consider the following varieties.

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Hyndman, J., Nation, J.B. (2018). 1-Unary Algebras. In: The Lattice of Subquasivarieties of a Locally Finite Quasivariety. CMS Books in Mathematics. Springer, Cham. https://doi.org/10.1007/978-3-319-78235-5_6

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