> 18-XX Category theory; homological algebra > 18FXX Categories and geometry

18F05 Local categories and functors	18F10 Grothendieck topologies	18F15 Abstract manifolds and fiber bundles
18F20 Presheaves and sheaves	18F25 Algebraic $K$-theory and $L$-theory	18F30 Grothendieck groups
18F99 None of the above, but in this section

18FXX Categories and geometry