Geometry, Algebraic 6 Algebra, Homological 2 Categories (Mathematics) 2 Homology theory 2 Sheaf theory 2 Abelian categories 1 Abelian varieties 1 Complexes 1 Fundamental groups (Mathematics) 1 Group schemes (Mathematics) 1 Group theory 1 L-functions 1 Schemes (Algebraic geometry) 1 Topological groups 1