Algebra and Geometry Seminar

The failure of the product formula for fundamental groups of schemes in characteristic p > 0 was explained by Drinfeld who proved a product formula holds by taking into account the extra Frobenius symmetry. In this work, we upgrade Drinfeld's equivalence to a Künneth-type equivalence of derived categories for appropriately defined categories of lisse and constructible Weil sheaves. This is joint work with Timo Richarz and Jakob Scholbach.