even lattice

A lattice $L$ in $\\mathbb{R}^{n}$ is if the norm of every vector in $L$ is an even integer. Note that because of the polarization identity

(x,y)=\\frac{(x+y,x+y)-(x,x)-(y,y)}{2}

it follows that all scalar products in an even lattice are .

随便看

数学辞典收录了18232条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。