2 problems

Let $\mathbb{A}$ be an involutive semilattice direct system of $\mathcal{L}$-algebras, whose corresponding involutive semilattice of indices is non-trivial. Identity-characterizati…

Let ${\bf A}$ be a non-trivial algebra of type $\mathcal{L}$ satisfying the De Morgan identities, with a De Morgan partition function $\odot$, and let…