Stratifications of the variety of R-trivial monoids
Research Report 94-40
Date: December 1994
In this paper we consider the variety R of R-trivial monoids.
After introducing the notion of a stratification of a variety, we
introduce and use the catalan monoid of a directed graph to generate
a stratification of R. Other stratifications of R are given and the
relationship between them is explored.
monoid. catalan. equation. variety. pseudovariety. stratification.
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Sydney Mathematics and Statistics