**People, research interests, and links to personal web pages:**

**Sophie Frisch** Commutative ring theory, polynomial functions on commutative rings and non-commutative algebras, topological methods in ring theory. **Sarah Nakat****o** (graduate student) **Amr Al-Maktry** (graduate student) **Former member**s: **Carmelo Finocchiaro** Multiplicative ideal theory, valuation theory, spectral spaces,

abstract Riemann surfaces. **Giulio Peruginelli **(U. Padova) Commutative ring theory, algebraic number theory, integer-valued polynomials **Roswitha Rissner** Commutative ring thoery, linear algebra over commutative rings.

We collaborate with mathematicians in France (Marseille, Amiens), Italy (Roma Tre, U. Padova), the USA (Penn State, SUNY, Ohio State), and in Vienna and other places.