Federico Scavia
CNRS and Université Sorbonne Paris Nord
Galois representations modulo p that do not lift modulo p^2
February 3, 2025
For every finite group H and every finite H-module A, we determine the subgroup of negligible classes in H^2(H,A), in the sense of Serre, over fields with enough roots of unity. As a consequence, we show that for every odd prime p and every field F containing a primitive p-th root of unity,... Read more
- Algebra and Algebraic geometry