Conjecture on semilattice-like terms in bounded width algebras

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Let A\mathbb{A} be an algebra of bounded width, and let w,sw,s be terms of its language. The conjectured identities are

w(x,x,y)≈w(x,y,x)≈w(y,x,x)≈s(x,y)w(x,x,y) \approx w(x,y,x) \approx w(y,x,x) \approx s(x,y)

and

s(x,s(x,y))≈s(s(x,y),x)≈s(x,y).s(x,s(x,y)) \approx s(s(x,y),x) \approx s(x,y).

Semilattice-like terms conjecture. Every bounded width algebra has terms w,sw,s satisfying these identities.

The conjecture is known in every spiral and in every majority algebra; if true, it would imply Bulatov's yellow connectivity property and related results by iteration. Its general case remains open in the supplied text.

References

Primary source

Zarathustra Brady, “Examples, counterexamples, and structure in bounded width algebras”, arXiv:1909.05901 (2020).

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