2012/05/08 by Bhargav Bhatt, Bhatt, Bhargav
Mathematics · #Algebraic Geometry (math.AG) #Commutative Algebra (math.AC) #FOS: Mathematics #Number Theory (math.NT) #math.AC #math.AG #math.NT
paper · pdf · doi:10.48550/arxiv.1205.1597
9 pages, comments welcome!
arxiv created 2012/05/08 · arxiv updated 2012/05/09
This note discusses some examples showing that the crystalline cohomology of even very mildly singular projective varieties tends to be quite large. In particular, any singular projective variety with at worst ordinary double points has infinitely generated crystalline cohomology in at least two cohomological degrees. These calculations rely critically on comparisons between crystalline and derived de Rham cohomology.