Minimal Taylor algebra structural conjecture

Let A\mathbb{A} be a minimal Taylor algebra, meaning a Taylor algebra whose clone is minimal in the sense used by the source, and suppose that A\mathbb{A} is generated by two elements a,bAa,b\in\mathbb{A}. A ternary absorbing subalgebra CZmathbbA\mathbb{C}\lhd_Zmathbb{A} is a proper subalgebra with the ternary absorption property denoted by lhdZlhd_Z in the source. Minimal Taylor structural conjecture. At least one of the following holds: A\mathbb{A} has a congruence quotient that is an affine algebra of prime order; it has a congruence quotient that is a two-element semilattice; it has a congruence quotient that is a two-element majority algebra; or there are proper ternary absorbing subalgebras C,DZmathbbA\mathbb{C},\mathbb{D}\lhd_Zmathbb{A} such that aCa\in\mathbb{C}, bDb\in\mathbb{D}, C\cupmathbbD=A\mathbb{C}\cupmathbb{D}=\mathbb{A}, and C\capmathbbD\mathbb{C}\capmathbb{D}\neq\varnothing. The conjecture is presented as unresolved and would provide a unified structural description.

Sources & referencesView supporting material

Primary source

Zarathustra Brady, “Notes on CSPs and Polymorphisms”, arXiv:2210.07383 (2025).

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