Ambrus Pal (Imperial College London): Vanishing of Massey products in Galois cohomology 1

One of the standard ways to study absolute Galois groups of fields is via embedding problems. These are not 
solvable in general, but recently a conjecture was made which identified a large class of embedding problems which should always have a solution. In my lectures I will introduce embedding problems and talk about the proof of a special case of this conjecture, joint work with Tomer Schlank, which uses the basics of motivic cohomology, some explicit computations with them, elementary group theory and some arithmetic geometry. I will not assume any familiarity with any of these subjects.