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Varieties of demi-pseudocomplemented lattices. (English) Zbl 0769.06007
The authors present a solution to the problem of desribing the structure of the lattice of subvarieties of the variety of demi $$p$$-lattices, and in particular of almost $$p$$-lattices. The main purpose is to present an infinite poset $$P_ 0$$ whose Hasse diagram is completely described by the following property: The lattice of subvarieties of the variety of demi-$$p$$-lattices is isomorphic to the lattice of order ideals of $$P_ 0$$.

##### MSC:
 06D15 Pseudocomplemented lattices 06B20 Varieties of lattices
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