Weak subalgebra lattices
Weak subalgebra lattices of monounary partial algebras
The weak hereditary class of a variety
We study the weak hereditary class of all weak subalgebras of algebras in a total variety . We establish an algebraic characterization, in the sense of Birkhoff’s HSP theorem, and a syntactical characterization of these classes. We also consider the problem of when such a weak hereditary class is weak equational.
Helena Rasiowa, 1917-1994
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