Equality of V(A∞) and the pseudo-regularization of V(A)
Determine whether the variety V(A∞) generated by the bisemilattice A∞ (constructed from a bounded lattice A by adjoining an element ∞ with operations a · ∞ = 0_A and a + ∞ = 1_A) coincides with the pseudo-regularization \overline{V(A)} of the lattice variety V(A).
References
We do not know if the varieties \mathsf{V}(A_{\infty}) and \overline{\mathsf{V}(A)} coincide.
— Semilattice sums of algebras and Mal'tsev products of varieties
(2603.29747 - Bergman et al., 31 Mar 2026) in Section 'Examples and counterexamples', Example [Semilattice sums of lattices]