Equivalence of definitions of subgroup
Channel: Vipul's Classroom
Date: 09/05/2013

Video created by Ruinan Liu and Vipul Naik. Based on content at http://groupprops.subwiki.org/wiki/Equivalence_of_definitions_of_subgroup (Tour version: http://groupprops.subwiki.org/wiki/Tour:Equivalence_of_definitions_of_subgroup )