Types of Reductive Monoids
1999
Abstract Let M be a reductive monoid with a reductive unit group G . Clearly there is a natural G × G action on M . The orbits are the J -classes (in the sense of semigroup theory) and form a finite lattice. The general problem of finding the lattice remains open. In this paper we study a new class of reductive monoids constructed by multilined closure. We obtain a general theorem to determine the lattices of these monoids. We find that the ( J , σ)-irreducible monoids of Suzuki type and Ree type belong to this new class. Using the general theorem we then list all the lattices and type maps of the ( J , σ)-irreducible monoids of Suzuki type and Ree type.
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