Article
Keywords:
lattice; convex sublattice; variety
Summary:
Let $CSub\,(\text{\bf K})$ denote the variety of lattices generated by convex sublattices of lattices in $\text{\bf K}$. For any proper variety $\text{\bf V}$, the variety $CSub\,(\text{\bf V})$ is proper. There are uncountably many varieties $\text{\bf V}$ with $CSub\,(\text{\bf V})=\text{\bf V}$.
References:
                        
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General Lattice Theory. Birkhäuser Verlag, 1978. 
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Lattices with unique complementation. Pacif. J. Math. 92 (1981), 1-13. 
MR 0618040 | 
Zbl 0468.06005