Even lattice
= Even lattice
{title2=$B(x,x)\in2\mathbb Z\quad\text{for all }x\in L$}
Every vector in an even lattice has even integral norm. The <E8 lattice> and the hyperbolic plane appearing in the <K3 intersection lattice> are examples.
= Even lattice
{title2=$B(x,x)\in2\mathbb Z\quad\text{for all }x\in L$}
Every vector in an even lattice has even integral norm. The <E8 lattice> and the hyperbolic plane appearing in the <K3 intersection lattice> are examples.