I’m a semigroup theorist who is also interested in group theory, representation theory and automata theory. I teach at the City College of New York.
- A new book: the representation theory of finite monoids
- The uniform word problem for finite semigroups
- The first order theory of two endomorphisms of a finite dimensional vector space is undecidable
- Equalizers of free monoid morphisms, supports of rational power series and a question of Pin
- Isomorphism of oriented matroids from a semigroup viewpoint