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Theorem List for Metamath Proof Explorer - 16801-16900   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremlubfval 16801* Value of the least upper bound function of a poset. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 6-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑠 𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦𝑠 𝑦 𝑧𝑥 𝑧)))    &   (𝜑𝐾𝑉)       (𝜑𝑈 = ((𝑠 ∈ 𝒫 𝐵 ↦ (𝑥𝐵 𝜓)) ↾ {𝑠 ∣ ∃!𝑥𝐵 𝜓}))

Theoremlubdm 16802* Domain of the least upper bound function of a poset. (Contributed by NM, 6-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑠 𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦𝑠 𝑦 𝑧𝑥 𝑧)))    &   (𝜑𝐾𝑉)       (𝜑 → dom 𝑈 = {𝑠 ∈ 𝒫 𝐵 ∣ ∃!𝑥𝐵 𝜓})

Theoremlubfun 16803 The LUB is a function. (Contributed by NM, 9-Sep-2018.)
𝑈 = (lub‘𝐾)       Fun 𝑈

Theoremlubeldm 16804* Member of the domain of the least upper bound function of a poset. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑆 𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑦 𝑧𝑥 𝑧)))    &   (𝜑𝐾𝑉)       (𝜑 → (𝑆 ∈ dom 𝑈 ↔ (𝑆𝐵 ∧ ∃!𝑥𝐵 𝜓)))

Theoremlubelss 16805 A member of the domain of the least upper bound function is a subset of the base set. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)       (𝜑𝑆𝐵)

Theoremlubeu 16806* Unique existence proper of a member of the domain of the least upper bound function of a poset. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑆 𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑦 𝑧𝑥 𝑧)))    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)       (𝜑 → ∃!𝑥𝐵 𝜓)

Theoremlubval 16807* Value of the least upper bound function of a poset. Out-of-domain arguments (those not satisfying 𝑆 ∈ dom 𝑈) are allowed for convenience, evaluating to the empty set. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 9-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑆 𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑦 𝑧𝑥 𝑧)))    &   (𝜑𝐾𝑉)    &   (𝜑𝑆𝐵)       (𝜑 → (𝑈𝑆) = (𝑥𝐵 𝜓))

Theoremlubcl 16808 The least upper bound function value belongs to the base set. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)       (𝜑 → (𝑈𝑆) ∈ 𝐵)

Theoremlubprop 16809* Properties of greatest lower bound of a poset. (Contributed by NM, 22-Oct-2011.) (Revised by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)       (𝜑 → (∀𝑦𝑆 𝑦 (𝑈𝑆) ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑦 𝑧 → (𝑈𝑆) 𝑧)))

Theoremluble 16810 The greatest lower bound is the least element. (Contributed by NM, 22-Oct-2011.) (Revised by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)    &   (𝜑𝑋𝑆)       (𝜑𝑋 (𝑈𝑆))

Theoremlublecllem 16811* Lemma for lublecl 16812 and lubid 16813. (Contributed by NM, 8-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑋𝐵)       ((𝜑𝑥𝐵) → ((∀𝑧 ∈ {𝑦𝐵𝑦 𝑋}𝑧 𝑥 ∧ ∀𝑤𝐵 (∀𝑧 ∈ {𝑦𝐵𝑦 𝑋}𝑧 𝑤𝑥 𝑤)) ↔ 𝑥 = 𝑋))

Theoremlublecl 16812* The set of all elements less than a given element has an LUB. (Contributed by NM, 8-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑋𝐵)       (𝜑 → {𝑦𝐵𝑦 𝑋} ∈ dom 𝑈)

Theoremlubid 16813* The LUB of elements less than or equal to a fixed value equals that value. (Contributed by NM, 19-Oct-2011.) (Revised by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑋𝐵)       (𝜑 → (𝑈‘{𝑦𝐵𝑦 𝑋}) = 𝑋)

Theoremglbfval 16814* Value of the greatest lower function of a poset. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 6-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑠 𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑠 𝑧 𝑦𝑧 𝑥)))    &   (𝜑𝐾𝑉)       (𝜑𝐺 = ((𝑠 ∈ 𝒫 𝐵 ↦ (𝑥𝐵 𝜓)) ↾ {𝑠 ∣ ∃!𝑥𝐵 𝜓}))

Theoremglbdm 16815* Domain of the greatest lower bound function of a poset. (Contributed by NM, 6-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑠 𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑠 𝑧 𝑦𝑧 𝑥)))    &   (𝜑𝐾𝑉)       (𝜑 → dom 𝐺 = {𝑠 ∈ 𝒫 𝐵 ∣ ∃!𝑥𝐵 𝜓})

Theoremglbfun 16816 The GLB is a function. (Contributed by NM, 9-Sep-2018.)
𝐺 = (glb‘𝐾)       Fun 𝐺

Theoremglbeldm 16817* Member of the domain of the greatest lower bound function of a poset. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑆 𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑧 𝑦𝑧 𝑥)))    &   (𝜑𝐾𝑉)       (𝜑 → (𝑆 ∈ dom 𝐺 ↔ (𝑆𝐵 ∧ ∃!𝑥𝐵 𝜓)))

Theoremglbelss 16818 A member of the domain of the greatest lower bound function is a subset of the base set. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝐺)       (𝜑𝑆𝐵)

Theoremglbeu 16819* Unique existence proper of a member of the domain of the greatest lower bound function of a poset. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑆 𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑧 𝑦𝑧 𝑥)))    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝐺)       (𝜑 → ∃!𝑥𝐵 𝜓)

Theoremglbval 16820* Value of the greatest lower bound function of a poset. Out-of-domain arguments (those not satisfying 𝑆 ∈ dom 𝑈) are allowed for convenience, evaluating to the empty set on both sides of the equality. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 9-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜓 ↔ (∀𝑦𝑆 𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑧 𝑦𝑧 𝑥)))    &   (𝜑𝐾𝑉)    &   (𝜑𝑆𝐵)       (𝜑 → (𝐺𝑆) = (𝑥𝐵 𝜓))

Theoremglbcl 16821 The least upper bound function value belongs to the base set. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝐺 = (glb‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝐺)       (𝜑 → (𝐺𝑆) ∈ 𝐵)

Theoremglbprop 16822* Properties of greatest lower bound of a poset. (Contributed by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (glb‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)       (𝜑 → (∀𝑦𝑆 (𝑈𝑆) 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑧 𝑦𝑧 (𝑈𝑆))))

Theoremglble 16823 The greatest lower bound is the least element. (Contributed by NM, 22-Oct-2011.) (Revised by NM, 7-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (glb‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑆 ∈ dom 𝑈)    &   (𝜑𝑋𝑆)       (𝜑 → (𝑈𝑆) 𝑋)

Theoremjoinfval 16824* Value of join function for a poset. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 9-Sep-2018.) TODO: prove joinfval2 16825 first to reduce net proof size (existence part)?
𝑈 = (lub‘𝐾)    &    = (join‘𝐾)       (𝐾𝑉 = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ {𝑥, 𝑦}𝑈𝑧})

Theoremjoinfval2 16825* Value of join function for a poset-type structure. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 9-Sep-2018.)
𝑈 = (lub‘𝐾)    &    = (join‘𝐾)       (𝐾𝑉 = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ({𝑥, 𝑦} ∈ dom 𝑈𝑧 = (𝑈‘{𝑥, 𝑦}))})

Theoremjoindm 16826* Domain of join function for a poset-type structure. (Contributed by NM, 16-Sep-2018.)
𝑈 = (lub‘𝐾)    &    = (join‘𝐾)       (𝐾𝑉 → dom = {⟨𝑥, 𝑦⟩ ∣ {𝑥, 𝑦} ∈ dom 𝑈})

Theoremjoindef 16827 Two ways to say that a join is defined. (Contributed by NM, 9-Sep-2018.)
𝑈 = (lub‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝑊)    &   (𝜑𝑌𝑍)       (𝜑 → (⟨𝑋, 𝑌⟩ ∈ dom ↔ {𝑋, 𝑌} ∈ dom 𝑈))

Theoremjoinval 16828 Join value. Since both sides evaluate to when they don't exist, for convenience we drop the {𝑋, 𝑌} ∈ dom 𝑈 requirement. (Contributed by NM, 9-Sep-2018.)
𝑈 = (lub‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝑊)    &   (𝜑𝑌𝑍)       (𝜑 → (𝑋 𝑌) = (𝑈‘{𝑋, 𝑌}))

Theoremjoincl 16829 Closure of join of elements in the domain. (Contributed by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → (𝑋 𝑌) ∈ 𝐵)

Theoremjoindmss 16830 Subset property of domain of join. (Contributed by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)       (𝜑 → dom ⊆ (𝐵 × 𝐵))

Theoremjoinval2lem 16831* Lemma for joinval2 16832 and joineu 16833. (Contributed by NM, 12-Sep-2018.) TODO: combine this through joineu into joinlem?
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)       ((𝑋𝐵𝑌𝐵) → ((∀𝑦 ∈ {𝑋, 𝑌}𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦 ∈ {𝑋, 𝑌}𝑦 𝑧𝑥 𝑧)) ↔ ((𝑋 𝑥𝑌 𝑥) ∧ ∀𝑧𝐵 ((𝑋 𝑧𝑌 𝑧) → 𝑥 𝑧))))

Theoremjoinval2 16832* Value of join for a poset with LUB expanded. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 11-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)       (𝜑 → (𝑋 𝑌) = (𝑥𝐵 ((𝑋 𝑥𝑌 𝑥) ∧ ∀𝑧𝐵 ((𝑋 𝑧𝑌 𝑧) → 𝑥 𝑧))))

Theoremjoineu 16833* Uniqueness of join of elements in the domain. (Contributed by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → ∃!𝑥𝐵 ((𝑋 𝑥𝑌 𝑥) ∧ ∀𝑧𝐵 ((𝑋 𝑧𝑌 𝑧) → 𝑥 𝑧)))

Theoremjoinlem 16834* Lemma for join properties. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → ((𝑋 (𝑋 𝑌) ∧ 𝑌 (𝑋 𝑌)) ∧ ∀𝑧𝐵 ((𝑋 𝑧𝑌 𝑧) → (𝑋 𝑌) 𝑧)))

Theoremlejoin1 16835 A join's first argument is less than or equal to the join. (Contributed by NM, 16-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑𝑋 (𝑋 𝑌))

Theoremlejoin2 16836 A join's second argument is less than or equal to the join. (Contributed by NM, 16-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑𝑌 (𝑋 𝑌))

Theoremjoinle 16837 A join is less than or equal to a third value iff each argument is less than or equal to the third value. (Contributed by NM, 16-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑𝑍𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → ((𝑋 𝑍𝑌 𝑍) ↔ (𝑋 𝑌) 𝑍))

Theoremmeetfval 16838* Value of meet function for a poset. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 9-Sep-2018.) TODO: prove meetfval2 16839 first to reduce net proof size (existence part)?
𝐺 = (glb‘𝐾)    &    = (meet‘𝐾)       (𝐾𝑉 = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ {𝑥, 𝑦}𝐺𝑧})

Theoremmeetfval2 16839* Value of meet function for a poset. (Contributed by NM, 12-Sep-2011.) (Revised by NM, 9-Sep-2018.)
𝐺 = (glb‘𝐾)    &    = (meet‘𝐾)       (𝐾𝑉 = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ({𝑥, 𝑦} ∈ dom 𝐺𝑧 = (𝐺‘{𝑥, 𝑦}))})

Theoremmeetdm 16840* Domain of meet function for a poset-type structure. (Contributed by NM, 16-Sep-2018.)
𝐺 = (glb‘𝐾)    &    = (meet‘𝐾)       (𝐾𝑉 → dom = {⟨𝑥, 𝑦⟩ ∣ {𝑥, 𝑦} ∈ dom 𝐺})

Theoremmeetdef 16841 Two ways to say that a meet is defined. (Contributed by NM, 9-Sep-2018.)
𝐺 = (glb‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝑊)    &   (𝜑𝑌𝑍)       (𝜑 → (⟨𝑋, 𝑌⟩ ∈ dom ↔ {𝑋, 𝑌} ∈ dom 𝐺))

Theoremmeetval 16842 Meet value. Since both sides evaluate to when they don't exist, for convenience we drop the {𝑋, 𝑌} ∈ dom 𝐺 requirement. (Contributed by NM, 9-Sep-2018.)
𝐺 = (glb‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝑊)    &   (𝜑𝑌𝑍)       (𝜑 → (𝑋 𝑌) = (𝐺‘{𝑋, 𝑌}))

Theoremmeetcl 16843 Closure of meet of elements in the domain. (Contributed by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → (𝑋 𝑌) ∈ 𝐵)

Theoremmeetdmss 16844 Subset property of domain of meet. (Contributed by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)       (𝜑 → dom ⊆ (𝐵 × 𝐵))

Theoremmeetval2lem 16845* Lemma for meetval2 16846 and meeteu 16847. (Contributed by NM, 12-Sep-2018.) TODO: combine this through meeteu into meetlem?
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)       ((𝑋𝐵𝑌𝐵) → ((∀𝑦 ∈ {𝑋, 𝑌}𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦 ∈ {𝑋, 𝑌}𝑧 𝑦𝑧 𝑥)) ↔ ((𝑥 𝑋𝑥 𝑌) ∧ ∀𝑧𝐵 ((𝑧 𝑋𝑧 𝑌) → 𝑧 𝑥))))

Theoremmeetval2 16846* Value of meet for a poset with LUB expanded. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 11-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)       (𝜑 → (𝑋 𝑌) = (𝑥𝐵 ((𝑥 𝑋𝑥 𝑌) ∧ ∀𝑧𝐵 ((𝑧 𝑋𝑧 𝑌) → 𝑧 𝑥))))

Theoremmeeteu 16847* Uniqueness of meet of elements in the domain. (Contributed by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → ∃!𝑥𝐵 ((𝑥 𝑋𝑥 𝑌) ∧ ∀𝑧𝐵 ((𝑧 𝑋𝑧 𝑌) → 𝑧 𝑥)))

Theoremmeetlem 16848* Lemma for meet properties. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → (((𝑋 𝑌) 𝑋 ∧ (𝑋 𝑌) 𝑌) ∧ ∀𝑧𝐵 ((𝑧 𝑋𝑧 𝑌) → 𝑧 (𝑋 𝑌))))

Theoremlemeet1 16849 A meet's first argument is less than or equal to the meet. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → (𝑋 𝑌) 𝑋)

Theoremlemeet2 16850 A meet's second argument is less than or equal to the meet. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → (𝑋 𝑌) 𝑌)

Theoremmeetle 16851 A meet is less than or equal to a third value iff each argument is less than or equal to the third value. (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑𝑍𝐵)    &   (𝜑 → ⟨𝑋, 𝑌⟩ ∈ dom )       (𝜑 → ((𝑍 𝑋𝑍 𝑌) ↔ 𝑍 (𝑋 𝑌)))

TheoremjoincomALT 16852 The join of a poset commutes. (This may not be a theorem under other definitions of meet.) (Contributed by NM, 16-Sep-2011.) (New usage is discouraged.) (Proof modification is discouraged.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾𝑉𝑋𝐵𝑌𝐵) → (𝑋 𝑌) = (𝑌 𝑋))

Theoremjoincom 16853 The join of a poset commutes. (The antecedent 𝑋, 𝑌⟩ ∈ dom ∧ ⟨𝑌, 𝑋⟩ ∈ dom i.e. "the joins exist" could be omitted as an artifact of our particular join definition, but other definitions may require it.) (Contributed by NM, 16-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       (((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) ∧ (⟨𝑋, 𝑌⟩ ∈ dom ∧ ⟨𝑌, 𝑋⟩ ∈ dom )) → (𝑋 𝑌) = (𝑌 𝑋))

TheoremmeetcomALT 16854 The meet of a poset commutes. (This may not be a theorem under other definitions of meet.) (Contributed by NM, 17-Sep-2011.) (New usage is discouraged.) (Proof modification is discouraged.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)       ((𝐾𝑉𝑋𝐵𝑌𝐵) → (𝑋 𝑌) = (𝑌 𝑋))

Theoremmeetcom 16855 The meet of a poset commutes. (The antecedent 𝑋, 𝑌⟩ ∈ dom ∧ ⟨𝑌, 𝑋⟩ ∈ dom i.e. "the meets exist" could be omitted as an artifact of our particular join definition, but other definitions may require it.) (Contributed by NM, 17-Sep-2011.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)       (((𝐾 ∈ Poset ∧ 𝑋𝐵𝑌𝐵) ∧ (⟨𝑋, 𝑌⟩ ∈ dom ∧ ⟨𝑌, 𝑋⟩ ∈ dom )) → (𝑋 𝑌) = (𝑌 𝑋))

Syntaxctos 16856 Extend class notation with the class of all tosets.
class Toset

Definitiondf-toset 16857* Define the class of totally ordered sets (tosets). (Contributed by FL, 17-Nov-2014.)
Toset = {𝑓 ∈ Poset ∣ [(Base‘𝑓) / 𝑏][(le‘𝑓) / 𝑟]𝑥𝑏𝑦𝑏 (𝑥𝑟𝑦𝑦𝑟𝑥)}

Theoremistos 16858* The predicate "is a toset." (Contributed by FL, 17-Nov-2014.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)       (𝐾 ∈ Toset ↔ (𝐾 ∈ Poset ∧ ∀𝑥𝐵𝑦𝐵 (𝑥 𝑦𝑦 𝑥)))

Theoremtosso 16859 Write the totally ordered set structure predicate in terms of the proper class strict order predicate. (Contributed by Mario Carneiro, 8-Feb-2015.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    < = (lt‘𝐾)       (𝐾𝑉 → (𝐾 ∈ Toset ↔ ( < Or 𝐵 ∧ ( I ↾ 𝐵) ⊆ )))

Syntaxcp0 16860 Extend class notation with poset zero.
class 0.

Syntaxcp1 16861 Extend class notation with poset unit.
class 1.

Definitiondf-p0 16862 Define poset zero. (Contributed by NM, 12-Oct-2011.)
0. = (𝑝 ∈ V ↦ ((glb‘𝑝)‘(Base‘𝑝)))

Definitiondf-p1 16863 Define poset unit. (Contributed by NM, 22-Oct-2011.)
1. = (𝑝 ∈ V ↦ ((lub‘𝑝)‘(Base‘𝑝)))

Theoremp0val 16864 Value of poset zero. (Contributed by NM, 12-Oct-2011.)
𝐵 = (Base‘𝐾)    &   𝐺 = (glb‘𝐾)    &    0 = (0.‘𝐾)       (𝐾𝑉0 = (𝐺𝐵))

Theoremp1val 16865 Value of poset zero. (Contributed by NM, 22-Oct-2011.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)    &    1 = (1.‘𝐾)       (𝐾𝑉1 = (𝑈𝐵))

Theoremp0le 16866 Any element is less than or equal to a poset's upper bound (if defined). (Contributed by NM, 22-Oct-2011.) (Revised by NM, 13-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝐺 = (glb‘𝐾)    &    = (le‘𝐾)    &    0 = (0.‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝐵 ∈ dom 𝐺)       (𝜑0 𝑋)

Theoremple1 16867 Any element is less than or equal to a poset's upper bound (if defined). (Contributed by NM, 22-Oct-2011.) (Revised by NM, 13-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)    &    = (le‘𝐾)    &    1 = (1.‘𝐾)    &   (𝜑𝐾𝑉)    &   (𝜑𝑋𝐵)    &   (𝜑𝐵 ∈ dom 𝑈)       (𝜑𝑋 1 )

9.2.2  Lattices

Syntaxclat 16868 Extend class notation with the class of all lattices.
class Lat

Definitiondf-lat 16869 Define the class of all lattices. A lattice is a poset in which the join and meet of any two elements always exists. (Contributed by NM, 18-Oct-2012.) (Revised by NM, 12-Sep-2018.)
Lat = {𝑝 ∈ Poset ∣ (dom (join‘𝑝) = ((Base‘𝑝) × (Base‘𝑝)) ∧ dom (meet‘𝑝) = ((Base‘𝑝) × (Base‘𝑝)))}

Theoremislat 16870 The predicate "is a lattice." (Contributed by NM, 18-Oct-2012.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       (𝐾 ∈ Lat ↔ (𝐾 ∈ Poset ∧ (dom = (𝐵 × 𝐵) ∧ dom = (𝐵 × 𝐵))))

Theoremlatcl2 16871 The join and meet of any two elements exist. (Contributed by NM, 14-Sep-2018.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)    &   (𝜑𝐾 ∈ Lat)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)       (𝜑 → (⟨𝑋, 𝑌⟩ ∈ dom ∧ ⟨𝑋, 𝑌⟩ ∈ dom ))

Theoremlatlem 16872 Lemma for lattice properties. (Contributed by NM, 14-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌) ∈ 𝐵 ∧ (𝑋 𝑌) ∈ 𝐵))

Theoremlatpos 16873 A lattice is a poset. (Contributed by NM, 17-Sep-2011.)
(𝐾 ∈ Lat → 𝐾 ∈ Poset)

Theoremlatjcl 16874 Closure of join operation in a lattice. (chjcom 27749 analog.) (Contributed by NM, 14-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌) ∈ 𝐵)

Theoremlatmcl 16875 Closure of meet operation in a lattice. (incom 3767 analog.) (Contributed by NM, 14-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌) ∈ 𝐵)

Theoremlatref 16876 A lattice ordering is reflexive. (ssid 3587 analog.) (Contributed by NM, 8-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵) → 𝑋 𝑋)

Theoremlatasymb 16877 A lattice ordering is asymmetric. (eqss 3583 analog.) (Contributed by NM, 22-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) ↔ 𝑋 = 𝑌))

Theoremlatasym 16878 A lattice ordering is asymmetric. (eqss 3583 analog.) (Contributed by NM, 8-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 𝑋) → 𝑋 = 𝑌))

Theoremlattr 16879 A lattice ordering is transitive. (sstr 3576 analog.) (Contributed by NM, 17-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌𝑌 𝑍) → 𝑋 𝑍))

Theoremlatasymd 16880 Deduce equality from lattice ordering. (eqssd 3585 analog.) (Contributed by NM, 18-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   (𝜑𝐾 ∈ Lat)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑𝑋 𝑌)    &   (𝜑𝑌 𝑋)       (𝜑𝑋 = 𝑌)

Theoremlattrd 16881 A lattice ordering is transitive. Deduction version of lattr 16879. (Contributed by NM, 3-Sep-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   (𝜑𝐾 ∈ Lat)    &   (𝜑𝑋𝐵)    &   (𝜑𝑌𝐵)    &   (𝜑𝑍𝐵)    &   (𝜑𝑋 𝑌)    &   (𝜑𝑌 𝑍)       (𝜑𝑋 𝑍)

Theoremlatjcom 16882 The join of a lattice commutes. (chjcom 27749 analog.) (Contributed by NM, 16-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌) = (𝑌 𝑋))

Theoremlatlej1 16883 A join's first argument is less than or equal to the join. (chub1 27750 analog.) (Contributed by NM, 17-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → 𝑋 (𝑋 𝑌))

Theoremlatlej2 16884 A join's second argument is less than or equal to the join. (chub2 27751 analog.) (Contributed by NM, 17-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → 𝑌 (𝑋 𝑌))

Theoremlatjle12 16885 A join is less than or equal to a third value iff each argument is less than or equal to the third value. (chlub 27752 analog.) (Contributed by NM, 17-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑍𝑌 𝑍) ↔ (𝑋 𝑌) 𝑍))

Theoremlatleeqj1 16886 Less-than-or-equal-to in terms of join. (chlejb1 27755 analog.) (Contributed by NM, 21-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌 ↔ (𝑋 𝑌) = 𝑌))

Theoremlatleeqj2 16887 Less-than-or-equal-to in terms of join. (chlejb2 27756 analog.) (Contributed by NM, 14-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌 ↔ (𝑌 𝑋) = 𝑌))

Theoremlatjlej1 16888 Add join to both sides of a lattice ordering. (chlej1i 27716 analog.) (Contributed by NM, 8-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌 → (𝑋 𝑍) (𝑌 𝑍)))

Theoremlatjlej2 16889 Add join to both sides of a lattice ordering. (chlej2i 27717 analog.) (Contributed by NM, 8-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌 → (𝑍 𝑋) (𝑍 𝑌)))

Theoremlatjlej12 16890 Add join to both sides of a lattice ordering. (chlej12i 27718 analog.) (Contributed by NM, 8-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵) ∧ (𝑍𝐵𝑊𝐵)) → ((𝑋 𝑌𝑍 𝑊) → (𝑋 𝑍) (𝑌 𝑊)))

Theoremlatnlej 16891 An idiom to express that a lattice element differs from two others. (Contributed by NM, 28-May-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → (𝑋𝑌𝑋𝑍))

Theoremlatnlej1l 16892 An idiom to express that a lattice element differs from two others. (Contributed by NM, 19-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → 𝑋𝑌)

Theoremlatnlej1r 16893 An idiom to express that a lattice element differs from two others. (Contributed by NM, 19-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → 𝑋𝑍)

Theoremlatnlej2 16894 An idiom to express that a lattice element differs from two others. (Contributed by NM, 10-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → (¬ 𝑋 𝑌 ∧ ¬ 𝑋 𝑍))

Theoremlatnlej2l 16895 An idiom to express that a lattice element differs from two others. (Contributed by NM, 19-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → ¬ 𝑋 𝑌)

Theoremlatnlej2r 16896 An idiom to express that a lattice element differs from two others. (Contributed by NM, 19-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵) ∧ ¬ 𝑋 (𝑌 𝑍)) → ¬ 𝑋 𝑍)

Theoremlatjidm 16897 Lattice join is idempotent. (Contributed by NM, 8-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵) → (𝑋 𝑋) = 𝑋)

Theoremlatmcom 16898 The join of a lattice commutes. (Contributed by NM, 6-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌) = (𝑌 𝑋))

Theoremlatmle1 16899 A meet is less than or equal to its first argument. (Contributed by NM, 21-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌) 𝑋)

Theoremlatmle2 16900 A meet is less than or equal to its second argument. (Contributed by NM, 21-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌) 𝑌)

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