**Office:** Katharine Reed Cudahy Hall,
Room 303

**Phone:** (414) 288-5229

** E-mail:** francis.pastijn@marquette.edu

- Semigroup Theory
- Algebra
- Formal Languages
- Geometry

- Algebra : groups, semigroups, lattices, universal algebra, semirings.

- L. Oliveira and Pastijn. Rees matrix covers and the translational hull of a locally inverse semigroup,
*Communications in Algebra*, 36 (2008), 3230-3249.

- L. Oliveira and Pastijn. Ideal extensions of locally inverse semigroups,
*Studia Sci. Math. Hungary***,**45 (2008), 395-409.

- L. Oliveira and Pastijn. Dense ideal extensions of strict regular semigroups
*,**Algebra and Discrete Mathematics 4*(2006), 67-80.

- Maximal dense ideal extensions of locally inverse semigroups,
*Semigroup Form 72*(2006), 441-458.

- Weak commutativity in idempotent semirings,
*Semigroup 72,*(2006), 283-311.