Two properties of the lattice of quasivarieties of pseudocomplemented semilattices are established, namely, in the quasivariety generated by the 3-element chain, there is a sublattice freely generated by ω elements and there are quasivarieties.
@article{bwmeta1.element.bwnjournal-article-fmv146i3p295bwm,
author = {M. Adams and Wies\l aw Dziobiak and Matthew Gould and J\"urg Schmid},
title = {Quasivarieties of pseudocomplemented semilattices},
journal = {Fundamenta Mathematicae},
volume = {146},
year = {1995},
pages = {295-312},
zbl = {0830.06003},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv146i3p295bwm}
}
Adams, M.; Dziobiak, Wiesław; Gould, Matthew; Schmid, Jürg. Quasivarieties of pseudocomplemented semilattices. Fundamenta Mathematicae, Tome 146 (1995) pp. 295-312. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv146i3p295bwm/
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