The paper investigates idempotent, reductive, and distributive groupoids, and more generally $\Omega$-algebras of any type including the structure of such groupoids as reducts. In particular, any such algebra can be built up from algebras with a left zero groupoid operation. It is also shown that any two varieties of left $k$-step reductive $\Omega$-algebras, and of right $n$-step reductive $\Omega$-algebras, are independent for any positive integers $k$ and $n$. This gives a structural description of algebras in the join of these two varieties.
@article{119118, author = {Anna B. Romanowska}, title = {On reductive and distributive algebras}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {40}, year = {1999}, pages = {617-629}, zbl = {1010.08002}, mrnumber = {1756540}, language = {en}, url = {http://dml.mathdoc.fr/item/119118} }
Romanowska, Anna B. On reductive and distributive algebras. Commentationes Mathematicae Universitatis Carolinae, Tome 40 (1999) pp. 617-629. http://gdmltest.u-ga.fr/item/119118/
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