Abstract
In 1987, Romanowska and Roszkowska found an explicit description of the lattice of varieties of differential groupoids. In 2008, the author proved that the lattice of quasivarieties of differential groupoids is \( \mathcal{Q} \)-universal. In the present article, we find an example of a minimal \( \mathcal{Q} \)-universal variety of differential groupoids.
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