Conjecture on semilattice-like terms in bounded width algebras

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.

Sources & referencesView supporting material

Primary source

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

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