Continuously factorable groupoids.
K. Sigmon, H.-T. Hu (1976)
Semigroup forum
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K. Sigmon, H.-T. Hu (1976)
Semigroup forum
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Mark V. Lawson (2005)
Cahiers de Topologie et Géométrie Différentielle Catégoriques
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Crvenković, Siniša, Dolinka, Igor, Marković, Petar (1999)
Novi Sad Journal of Mathematics
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G. Szeto (1976/77)
Semigroup forum
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E.Ja. Gabovic (1974)
Semigroup forum
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Aleksandr Kravchenko (2008)
Commentationes Mathematicae Universitatis Carolinae
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The main result of Romanowska A., Roszkowska B., , Demonstratio Math. (1987), no. 1–2, 277–290, provides us with an explicit description of the lattice of varieties of differential groupoids. In the present article, we show that this variety is -universal, which means that there is no convenient explicit description for the lattice of quasivarieties of differential groupoids. We also find an example of a subvariety of differential groupoids with a finite number of subquasivarieties. ...
Milan Trch (2009)
Acta Universitatis Carolinae. Mathematica et Physica
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