# Giorgis Petridis awarded NSF grant

Giorgis Petridis, a visiting assistant professor,
received an NSF grant for his proposal entitled *Direct and inverse problems for cardinality
questions in additive number theory*.” The amount of the grant is $109,438 and
the duration is three years.

The main subject matter of the grant is additive number theory, and in particular, cardinality questions in the theory of set addition. Petridis has been a leading figure in this field since he gave a “book” proof of the celebrated Plunnecke theory in his Ph.D. dissertation written under the direction of Timothy Gowers at the University of Cambridge.