i1 : K3(6,1,-2) o1 = K3 surface with rank 2 lattice defined by the intersection matrix: | 10 1 | | 1 -2 | -- (1,0): K3 surface of genus 6 and degree 10 containing rational curve of degree 1 (GM fourfold) -- (2,0): K3 surface of genus 21 and degree 40 containing rational curve of degree 2 o1 : Lattice-polarized K3 surface |
The object K3 is a method function with options.