{ localUrl: '../page/lagrange_theorem_on_subgroup_size.html', arbitalUrl: 'https://arbital.com/p/lagrange_theorem_on_subgroup_size', rawJsonUrl: '../raw/4jn.json', likeableId: '3111', likeableType: 'page', myLikeValue: '0', likeCount: '1', dislikeCount: '0', likeScore: '1', individualLikes: [ 'EricBruylant' ], pageId: 'lagrange_theorem_on_subgroup_size', edit: '2', editSummary: '', prevEdit: '1', currentEdit: '2', wasPublished: 'true', type: 'wiki', title: 'Lagrange theorem on subgroup size', clickbait: 'Lagrange's Theorem is an important restriction on the sizes of subgroups of a finite group.', textLength: '608', alias: 'lagrange_theorem_on_subgroup_size', externalUrl: '', sortChildrenBy: 'likes', hasVote: 'false', voteType: '', votesAnonymous: 'false', editCreatorId: 'PatrickStevens', editCreatedAt: '2016-06-17 21:24:51', pageCreatorId: 'PatrickStevens', pageCreatedAt: '2016-06-17 21:24:38', seeDomainId: '0', editDomainId: 'AlexeiAndreev', submitToDomainId: '0', isAutosave: 'false', isSnapshot: 'false', isLiveEdit: 'true', isMinorEdit: 'false', indirectTeacher: 'false', todoCount: '0', isEditorComment: 'false', isApprovedComment: 'true', isResolved: 'false', snapshotText: '', anchorContext: '', anchorText: '', anchorOffset: '0', mergedInto: '', isDeleted: 'false', viewCount: '78', text: 'Lagrange's Theorem states that if $G$ is a finite [-3gd] and $H$ a subgroup, then the [3gg order] $|H|$ of $H$ divides the order $|G|$ of $G$.\nIt generalises to infinite groups: the statement then becomes that the [4j4 left cosets] form a [set_partition partition], and for any pair of cosets, there is a [499 bijection] between them.\n\n# Proof\n\nIn full generality, the cosets [4j5 form a partition] and [4j8 are all in bijection].\n\nTo specialise this to the finite case, we have divided the $|G|$ elements of $G$ into buckets of size $|H|$ (namely, the cosets), so $|G|/|H|$ must in particular be an integer.', metaText: '', isTextLoaded: 'true', isSubscribedToDiscussion: 'false', 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