Distributive dual p-algebras

Abbreviation: DdpAlg

Definition

A distributive dual p-algebra is a structure $\mathbf{L}=\langle L,\vee ,0,\wedge ,1,^+\rangle$ such that

$\langle L,\vee,0,\wedge,1\rangle$ is a bounded distributive lattices

$x^+$ is the dual pseudocomplement of $x$: $x^+\leq y \iff x\vee y=1$

Morphisms

Let $\mathbf{L}$ and $\mathbf{M}$ be distributive dual p-algebras. A morphism from $\mathbf{L}$ to $\mathbf{M}$ is a function $h:L\rightarrow M$ that is a homomorphism:

$h(x\vee y)=h(x)\vee h(y)$, $h(x\wedge y)=h(x)\wedge h(y)$, $h(0)=0$, $h(1)=1$, $h(x^+)=h(x)^+$

Example 1:

Properties

Classtype variety decidable yes yes yes yes

Finite members

$\begin{array}{lr} f(1)= &1\\ f(2)= &1\\ f(3)= &1\\ f(4)= &\\ f(5)= &\\ f(6)= &\\ f(7)= &\\ \end{array}$