Seminar series
Date
Mon, 20 Oct 2025
16:00
16:00
Location
C3
Speaker
Zachary Feng
Organisation
University of Oxford
Goursat’s Lemma is an elementary, but perhaps niche, result in group theory classifying subdirect products of the product of two groups. In this talk, I will review what this lemma says, and describe how it can be used to deduce the irreducibility of Galois representations.