1 – Intro | K3 surfaces & Lattices When X is K3 then H2(X,Z)≃U⊕U⊕U⊕E8(−1)⊕E8(−1)thus endowing H2(X,Z) with a lattice structure, called the K3 lattice. For any primitive hyperbolic sublattice S of the K3 lattice, there exists a K3 surface X such that S≃NS(X). Previous Next