index (group theory) The index of a subgroup H in a group G, denoted |G : H|, is the number of (left or right) cosets of H. If G is finite, then |G : H| = |G|/|H| by Lagrange's theorem.
index
数学辞典收录了4151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。