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', textLength: '214', alias: 'in_notation', externalUrl: '', sortChildrenBy: 'likes', hasVote: 'false', voteType: '', votesAnonymous: 'false', editCreatorId: 'EricBruylant', editCreatedAt: '2016-08-27 14:02:06', pageCreatorId: 'QiaochuYuan', pageCreatedAt: '2016-05-27 18:36:50', 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: '48', text: 'In mathematics, the notation $x \\in X$ (where $\\in$ is written "\\in" in [5xw]) means that $X$ is a [3jz set] and $x$ is an element of that set.\n\n# Examples\n\n$r \\in \\mathbb{R}$ means that $r$ is a [4bc real number].', metaText: '', isTextLoaded: 'true', isSubscribedToDiscussion: 'false', isSubscribedToUser: 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