{ localUrl: '../page/math_join.html', arbitalUrl: 'https://arbital.com/p/math_join', rawJsonUrl: '../raw/3rc.json', likeableId: '2653', likeableType: 'page', myLikeValue: '0', likeCount: '2', dislikeCount: '0', likeScore: '2', individualLikes: [ 'EricBruylant', 'azoubd' ], pageId: 'math_join', edit: '46', editSummary: 'typo fix', prevEdit: '45', currentEdit: '46', wasPublished: 'true', type: 'wiki', title: 'Join and meet', clickbait: '', textLength: '2870', alias: 'math_join', externalUrl: '', sortChildrenBy: 'likes', hasVote: 'false', voteType: '', votesAnonymous: 'false', editCreatorId: 'KevinClancy', editCreatedAt: '2016-12-21 05:42:35', pageCreatorId: 'KevinClancy', pageCreatedAt: '2016-05-21 22:30:25', 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: '242', text: '[summary: Let $\\langle P, \\leq \\rangle$ be a [3rb poset], and let $S \\subseteq P$. The **join** of $S$ in $P$, denoted by $\\bigvee_P S$, is an element $p \\in P$ satisfying the following two properties:\n\n* p is an *upper bound* of $S$; that is, for all $s \\in S$, $s \\leq p$.\n* For all upper bounds $q$ of $S$ in $P$, $p \\leq q$.\n\n$\\bigvee_P S$ does not necessarily exist, but if it does then it is unique. The notation $\\bigvee S$ is typically used instead of $\\bigvee_P S$ when $P$ is clear from context. Joins are often called *least upper bounds* or *supremums*. For $a, b$ in $P$, the join of $\\{a,b\\}$ in $P$ is denoted by $a \\vee_P b$, or $a \\vee b$ when $P$ is clear from context. **Meets** are greatest lower bounds, and are related to joins by duality. \n]\n\nLet $\\langle P, \\leq \\rangle$ be a [-3rb], and let $S \\subseteq P$. The **join** of $S$ in $P$, denoted by $\\bigvee_P S$, is an element $p \\in P$ satisfying the following two properties:\n\n* p is an *upper bound* of $S$; that is, for all $s \\in S$, $s \\leq p$.\n* For all upper bounds $q$ of $S$ in $P$, $p \\leq q$.\n\n$\\bigvee_P S$ does not necessarily exist, but if it does then it is unique. The notation $\\bigvee S$ is typically used instead of $\\bigvee_P S$ when $P$ is clear from context. Joins are often called *least upper bounds* or *supremums*. For $a, b$ in $P$, the join of $\\{a,b\\}$ in $P$ is denoted by $a \\vee_P b$, or $a \\vee b$ when $P$ is clear from context.\n\nThe dual concept of the join is that of the meet. The **meet** of $S$ in $P$, denoted by $\\bigwedge_P S$, is defined an element $p \\in P$ satisfying.\n\n* p is a *lower bound* of $S$; that is, for all $s$ in $S$, $p \\leq s$.\n* For all lower bounds $q$ of $S$ in $P$, $q \\leq p$.\n\nMeets are also called *infimums*, or *greatest lower bounds*. The notations $\\bigwedge S$, $p \\wedge_P q$, and $p \\wedge q$ are all have meanings that are completely analogous to the aforementioned notations for joins. \n\nBasic example\n--------------------------\n\n![Joins Failing to exist in a finite lattice](http://i.imgur.com/sx1Ss9w.png)\n\nThe above Hasse diagram represents a poset with elements $a$, $b$, $c$, and $d$. $\\bigvee \\{a,b\\}$ does not exist because the set $\\{a,b\\}$ has no upper bounds. $\\bigvee \\{c,d\\}$ does not exist for a different reason: although $\\{c, d\\}$ has upper bounds $a$ and $b$, these upper bounds are incomparable, and so $\\{c, d\\}$ has no *least* upper bound. There do exist subsets of this poset which possess joins; for example, $a \\vee c = a$, $\\bigvee \\{b,c,d\\} = b$, and $\\bigvee \\{c\\} = c$.\n\nNow for some examples of meets. $\\bigwedge \\{a, b, c, d\\}$ does not exist because $c$ and $d$ have no common lower bounds. However, $\\bigwedge \\{a,b,d\\} = d$ and $a \\wedge c = c$.\n\nAdditional Material\n---------------------------------\n\n* [3v4 Examples]\n* [4ll Exercises]\n\nFurther reading\n---------------\n* [46c Lattices]\n', metaText: '', isTextLoaded: 'true', isSubscribedToDiscussion: 'false', isSubscribedToUser: 'false', isSubscribedAsMaintainer: 'false', discussionSubscriberCount: '1', maintainerCount: '1', userSubscriberCount: '0', lastVisit: '', hasDraft: 'false', votes: [], voteSummary: [ '0', '0', '0', '0', '0', '0', '0', '0', '0', '0' ], muVoteSummary: '0', voteScaling: '0', currentUserVote: '-2', voteCount: '0', lockedVoteType: '', maxEditEver: '0', redLinkCount: '0', lockedBy: '', lockedUntil: '', nextPageId: '', prevPageId: '', usedAsMastery: 'true', proposalEditNum: '0', permissions: { edit: { has: 'false', reason: 'You don't have domain permission to edit this page' }, proposeEdit: { has: 'true', reason: '' }, delete: { has: 'false', reason: 'You don't have domain permission to delete this page' }, comment: { has: 'false', reason: 'You can't comment in this domain because you are not a member' }, proposeComment: { has: 'true', reason: '' } }, summaries: { Summary: 'Let $\\langle P, \\leq \\rangle$ be a [3rb poset], and let $S \\subseteq P$. The **join** of $S$ in $P$, denoted by $\\bigvee_P S$, is an element $p \\in P$ satisfying the following two properties:\n\n* p is an *upper bound* of $S$; that is, for all $s \\in S$, $s \\leq p$.\n* For all upper bounds $q$ of $S$ in $P$, $p \\leq q$.\n\n$\\bigvee_P S$ does not necessarily exist, but if it does then it is unique. The notation $\\bigvee S$ is typically used instead of $\\bigvee_P S$ when $P$ is clear from context. Joins are often called *least upper bounds* or *supremums*. For $a, b$ in $P$, the join of $\\{a,b\\}$ in $P$ is denoted by $a \\vee_P b$, or $a \\vee b$ when $P$ is clear from context. **Meets** are greatest lower bounds, and are related to joins by duality.' }, creatorIds: [ 'KevinClancy', 'EricBruylant' ], childIds: [ 'join_examples', 'poset_join_exercises' ], parentIds: [ 'order_theory' ], commentIds: [ '3rj' ], questionIds: [], tagIds: [ 'math2', 'b_class_meta_tag' ], relatedIds: [], markIds: [], explanations: [ { id: '5322', parentId: 'math_join', childId: 'math_join', type: 'subject', creatorId: 'KevinClancy', createdAt: '2016-07-16 19:24:41', level: '3', isStrong: 'true', everPublished: 'true' } ], learnMore: [], requirements: [ { id: '3328', parentId: 'poset', childId: 'math_join', type: 'requirement', creatorId: 'AlexeiAndreev', createdAt: '2016-06-17 21:58:56', level: '3', isStrong: 'true', everPublished: 'true' } ], subjects: [ { id: '5322', parentId: 'math_join', childId: 'math_join', type: 'subject', creatorId: 'KevinClancy', 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