3 problems
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The identity characterization of De Morgan Płonka sums
Let be an involutive semilattice direct system of -algebras, whose corresponding involutive semilattice of indices is non-trivial. Identity-characterizati…
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The characterization of index varieties for De Morgan Płonka decompositions
Let be a non-trivial algebra of type satisfying the De Morgan identities, with a De Morgan partition function , and let…
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The direct-product conjecture for balanced regularisations
Let be a symmetric strongly irregular variety. Its balanced regularisation is the variety obtained by imposing balanced identities in the corresponding regularisation…