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Theorem List for Metamath Proof Explorer - 16901-17000   *Has distinct variable group(s)
TypeLabelDescription
Statement

Theoremlatlem12 16901 An element is less than or equal to a meet iff the element is less than or equal to each argument of the meet. (Contributed by NM, 21-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌𝑋 𝑍) ↔ 𝑋 (𝑌 𝑍)))

Theoremlatleeqm1 16902 Less-than-or-equal-to in terms of meet. (Contributed by NM, 7-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌 ↔ (𝑋 𝑌) = 𝑋))

Theoremlatleeqm2 16903 Less-than-or-equal-to in terms of meet. (Contributed by NM, 7-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌 ↔ (𝑌 𝑋) = 𝑋))

Theoremlatmlem1 16904 Add meet to both sides of a lattice ordering. (Contributed by NM, 10-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌 → (𝑋 𝑍) (𝑌 𝑍)))

Theoremlatmlem2 16905 Add meet to both sides of a lattice ordering. (sslin 3801 analog.) (Contributed by NM, 10-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌 → (𝑍 𝑋) (𝑍 𝑌)))

Theoremlatmlem12 16906 Add join to both sides of a lattice ordering. (ss2in 3802 analog.) (Contributed by NM, 10-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵) ∧ (𝑍𝐵𝑊𝐵)) → ((𝑋 𝑌𝑍 𝑊) → (𝑋 𝑍) (𝑌 𝑊)))

Theoremlatnlemlt 16907 Negation of less-than-or-equal-to expressed in terms of meet and less-than. (nssinpss 3818 analog.) (Contributed by NM, 5-Feb-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    < = (lt‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (¬ 𝑋 𝑌 ↔ (𝑋 𝑌) < 𝑋))

Theoremlatnle 16908 Equivalent expressions for "not less than" in a lattice. (chnle 27757 analog.) (Contributed by NM, 16-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    < = (lt‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (¬ 𝑌 𝑋𝑋 < (𝑋 𝑌)))

Theoremlatmidm 16909 Lattice join is idempotent. (inidm 3784 analog.) (Contributed by NM, 8-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵) → (𝑋 𝑋) = 𝑋)

Theoremlatabs1 16910 Lattice absorption law. From definition of lattice in [Kalmbach] p. 14. (chabs1 27759 analog.) (Contributed by NM, 8-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 (𝑋 𝑌)) = 𝑋)

Theoremlatabs2 16911 Lattice absorption law. From definition of lattice in [Kalmbach] p. 14. (chabs2 27760 analog.) (Contributed by NM, 8-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵𝑌𝐵) → (𝑋 (𝑋 𝑌)) = 𝑋)

Theoremlatledi 16912 An ortholattice is distributive in one ordering direction. (ledi 27783 analog.) (Contributed by NM, 7-Nov-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌) (𝑋 𝑍)) (𝑋 (𝑌 𝑍)))

Theoremlatmlej11 16913 Ordering of a meet and join with a common variable. (Contributed by NM, 4-Oct-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌) (𝑋 𝑍))

Theoremlatmlej12 16914 Ordering of a meet and join with a common variable. (Contributed by NM, 4-Oct-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑌) (𝑍 𝑋))

Theoremlatmlej21 16915 Ordering of a meet and join with a common variable. (Contributed by NM, 4-Oct-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑌 𝑋) (𝑋 𝑍))

Theoremlatmlej22 16916 Ordering of a meet and join with a common variable. (Contributed by NM, 4-Oct-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑌 𝑋) (𝑍 𝑋))

Theoremlubsn 16917 The least upper bound of a singleton. (chsupsn 27656 analog.) (Contributed by NM, 20-Oct-2011.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ Lat ∧ 𝑋𝐵) → (𝑈‘{𝑋}) = 𝑋)

Theoremlatjass 16918 Lattice join is associative. Lemma 2.2 in [MegPav2002] p. 362. (chjass 27776 analog.) (Contributed by NM, 17-Sep-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌) 𝑍) = (𝑋 (𝑌 𝑍)))

Theoremlatj12 16919 Swap 1st and 2nd members of lattice join. (chj12 27777 analog.) (Contributed by NM, 4-Jun-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 (𝑌 𝑍)) = (𝑌 (𝑋 𝑍)))

Theoremlatj32 16920 Swap 2nd and 3rd members of lattice join. Lemma 2.2 in [MegPav2002] p. 362. (Contributed by NM, 2-Dec-2011.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌) 𝑍) = ((𝑋 𝑍) 𝑌))

Theoremlatj13 16921 Swap 1st and 3rd members of lattice join. (Contributed by NM, 4-Jun-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 (𝑌 𝑍)) = (𝑍 (𝑌 𝑋)))

Theoremlatj31 16922 Swap 2nd and 3rd members of lattice join. Lemma 2.2 in [MegPav2002] p. 362. (Contributed by NM, 23-Jun-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌) 𝑍) = ((𝑍 𝑌) 𝑋))

Theoremlatjrot 16923 Rotate lattice join of 3 classes. (Contributed by NM, 23-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌) 𝑍) = ((𝑍 𝑋) 𝑌))

Theoremlatj4 16924 Rearrangement of lattice join of 4 classes. (chj4 27778 analog.) (Contributed by NM, 14-Jun-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵) ∧ (𝑍𝐵𝑊𝐵)) → ((𝑋 𝑌) (𝑍 𝑊)) = ((𝑋 𝑍) (𝑌 𝑊)))

Theoremlatj4rot 16925 Rotate lattice join of 4 classes. (Contributed by NM, 11-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵) ∧ (𝑍𝐵𝑊𝐵)) → ((𝑋 𝑌) (𝑍 𝑊)) = ((𝑊 𝑋) (𝑌 𝑍)))

Theoremlatjjdi 16926 Lattice join distributes over itself. (Contributed by NM, 30-Jul-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 (𝑌 𝑍)) = ((𝑋 𝑌) (𝑋 𝑍)))

Theoremlatjjdir 16927 Lattice join distributes over itself. (Contributed by NM, 2-Aug-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → ((𝑋 𝑌) 𝑍) = ((𝑋 𝑍) (𝑌 𝑍)))

Theoremmod1ile 16928 The weak direction of the modular law (e.g., pmod1i 34152, atmod1i1 34161) that holds in any lattice. (Contributed by NM, 11-May-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑋 𝑍 → (𝑋 (𝑌 𝑍)) ((𝑋 𝑌) 𝑍)))

Theoremmod2ile 16929 The weak direction of the modular law (e.g., pmod2iN 34153) that holds in any lattice. (Contributed by NM, 11-May-2012.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &    = (join‘𝐾)    &    = (meet‘𝐾)       ((𝐾 ∈ Lat ∧ (𝑋𝐵𝑌𝐵𝑍𝐵)) → (𝑍 𝑋 → ((𝑋 𝑌) 𝑍) (𝑋 (𝑌 𝑍))))

Syntaxccla 16930 Extend class notation with complete lattices.
class CLat

Definitiondf-clat 16931 Define the class of all complete lattices, where every subset of the base set has an LUB and a GLB. (Contributed by NM, 18-Oct-2012.) (Revised by NM, 12-Sep-2018.)
CLat = {𝑝 ∈ Poset ∣ (dom (lub‘𝑝) = 𝒫 (Base‘𝑝) ∧ dom (glb‘𝑝) = 𝒫 (Base‘𝑝))}

Theoremisclat 16932 The predicate "is a complete lattice." (Contributed by NM, 18-Oct-2012.) (Revised by NM, 12-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)    &   𝐺 = (glb‘𝐾)       (𝐾 ∈ CLat ↔ (𝐾 ∈ Poset ∧ (dom 𝑈 = 𝒫 𝐵 ∧ dom 𝐺 = 𝒫 𝐵)))

Theoremclatpos 16933 A complete lattice is a poset. (Contributed by NM, 8-Sep-2018.)
(𝐾 ∈ CLat → 𝐾 ∈ Poset)

Theoremclatlem 16934 Lemma for properties of a complete lattice. (Contributed by NM, 14-Sep-2011.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → ((𝑈𝑆) ∈ 𝐵 ∧ (𝐺𝑆) ∈ 𝐵))

Theoremclatlubcl 16935 Any subset of the base set has an LUB in a complete lattice. (Contributed by NM, 14-Sep-2011.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → (𝑈𝑆) ∈ 𝐵)

Theoremclatlubcl2 16936 Any subset of the base set has an LUB in a complete lattice. (Contributed by NM, 13-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → 𝑆 ∈ dom 𝑈)

Theoremclatglbcl 16937 Any subset of the base set has a GLB in a complete lattice. (Contributed by NM, 14-Sep-2011.)
𝐵 = (Base‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → (𝐺𝑆) ∈ 𝐵)

Theoremclatglbcl2 16938 Any subset of the base set has a GLB in a complete lattice. (Contributed by NM, 13-Sep-2018.)
𝐵 = (Base‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → 𝑆 ∈ dom 𝐺)

Theoremclatl 16939 A complete lattice is a lattice. (Contributed by NM, 18-Sep-2011.) TODO: use eqrelrdv2 5142 to shorten proof and eliminate joindmss 16830 and meetdmss 16844?
(𝐾 ∈ CLat → 𝐾 ∈ Lat)

Theoremisglbd 16940* Properties that determine the greatest lower bound of a complete lattice. (Contributed by Mario Carneiro, 19-Mar-2014.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)    &   ((𝜑𝑦𝑆) → 𝐻 𝑦)    &   ((𝜑𝑥𝐵 ∧ ∀𝑦𝑆 𝑥 𝑦) → 𝑥 𝐻)    &   (𝜑𝐾 ∈ CLat)    &   (𝜑𝑆𝐵)    &   (𝜑𝐻𝐵)       (𝜑 → (𝐺𝑆) = 𝐻)

Theoremlublem 16941* Lemma for the least upper bound properties in a complete lattice. (Contributed by NM, 19-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → (∀𝑦𝑆 𝑦 (𝑈𝑆) ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑦 𝑧 → (𝑈𝑆) 𝑧)))

Theoremlubub 16942 The LUB of a complete lattice subset is an upper bound. (Contributed by NM, 19-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵𝑋𝑆) → 𝑋 (𝑈𝑆))

Theoremlubl 16943* The LUB of a complete lattice subset is the least bound. (Contributed by NM, 19-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵𝑋𝐵) → (∀𝑦𝑆 𝑦 𝑋 → (𝑈𝑆) 𝑋))

Theoremlubss 16944 Subset law for least upper bounds. (chsupss 27585 analog.) (Contributed by NM, 20-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑇𝐵𝑆𝑇) → (𝑈𝑆) (𝑈𝑇))

Theoremlubel 16945 An element of a set is less than or equal to the least upper bound of the set. (Contributed by NM, 21-Oct-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑋𝑆𝑆𝐵) → 𝑋 (𝑈𝑆))

Theoremlubun 16946 The LUB of a union. (Contributed by NM, 5-Mar-2012.)
𝐵 = (Base‘𝐾)    &    = (join‘𝐾)    &   𝑈 = (lub‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵𝑇𝐵) → (𝑈‘(𝑆𝑇)) = ((𝑈𝑆) (𝑈𝑇)))

Theoremclatglb 16947* Properties of greatest lower bound of a complete lattice. (Contributed by NM, 5-Dec-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵) → (∀𝑦𝑆 (𝐺𝑆) 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑧 𝑦𝑧 (𝐺𝑆))))

Theoremclatglble 16948 The greatest lower bound is the least element. (Contributed by NM, 5-Dec-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑆𝐵𝑋𝑆) → (𝐺𝑆) 𝑋)

Theoremclatleglb 16949* Two ways of expressing "less than or equal to the greatest lower bound." (Contributed by NM, 5-Dec-2011.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑋𝐵𝑆𝐵) → (𝑋 (𝐺𝑆) ↔ ∀𝑦𝑆 𝑋 𝑦))

Theoremclatglbss 16950 Subset law for greatest lower bound. (Contributed by Mario Carneiro, 16-Apr-2014.)
𝐵 = (Base‘𝐾)    &    = (le‘𝐾)    &   𝐺 = (glb‘𝐾)       ((𝐾 ∈ CLat ∧ 𝑇𝐵𝑆𝑇) → (𝐺𝑇) (𝐺𝑆))

9.2.3  The dual of an ordered set

Syntaxcodu 16951 Class function defining dual orders.
class ODual

Definitiondf-odu 16952 Define the dual of an ordered structure, which replaces the order component of the structure with its reverse. See odubas 16956, oduleval 16954, and oduleg 16955 for its principal properties.

EDITORIAL: likely usable to simplify many lattice proofs, as it allows for duality arguments to be formalized; for instance latmass 17011. (Contributed by Stefan O'Rear, 29-Jan-2015.)

ODual = (𝑤 ∈ V ↦ (𝑤 sSet ⟨(le‘ndx), (le‘𝑤)⟩))

Theoremoduval 16953 Value of an order dual structure. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &    = (le‘𝑂)       𝐷 = (𝑂 sSet ⟨(le‘ndx), ⟩)

Theoremoduleval 16954 Value of the less-equal relation in an order dual structure. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &    = (le‘𝑂)        = (le‘𝐷)

Theoremoduleg 16955 Truth of the less-equal relation in an order dual structure. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &    = (le‘𝑂)    &   𝐺 = (le‘𝐷)       ((𝐴𝑉𝐵𝑊) → (𝐴𝐺𝐵𝐵 𝐴))

Theoremodubas 16956 Base set of an order dual structure. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &   𝐵 = (Base‘𝑂)       𝐵 = (Base‘𝐷)

Theorempospropd 16957* Posethood is determined only by structure components and only by the value of the relation within the base set. (Contributed by Stefan O'Rear, 29-Jan-2015.)
(𝜑𝐾𝑉)    &   (𝜑𝐿𝑊)    &   (𝜑𝐵 = (Base‘𝐾))    &   (𝜑𝐵 = (Base‘𝐿))    &   ((𝜑 ∧ (𝑥𝐵𝑦𝐵)) → (𝑥(le‘𝐾)𝑦𝑥(le‘𝐿)𝑦))       (𝜑 → (𝐾 ∈ Poset ↔ 𝐿 ∈ Poset))

Theoremodupos 16958 Being a poset is a self-dual property. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)       (𝑂 ∈ Poset → 𝐷 ∈ Poset)

Theoremoduposb 16959 Being a poset is a self-dual property. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)       (𝑂𝑉 → (𝑂 ∈ Poset ↔ 𝐷 ∈ Poset))

Theoremmeet0 16960 Lemma for odujoin 16965. (Contributed by Stefan O'Rear, 29-Jan-2015.) TODO (df-riota 6511 update): This proof increased from 152 bytes to 547 bytes after the df-riota 6511 change. Any way to shorten it? join0 16961 also.
(meet‘∅) = ∅

Theoremjoin0 16961 Lemma for odumeet 16963. (Contributed by Stefan O'Rear, 29-Jan-2015.)
(join‘∅) = ∅

Theoremoduglb 16962 Greatest lower bounds in a dual order are least upper bounds in the original order. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &   𝑈 = (lub‘𝑂)       (𝑂𝑉𝑈 = (glb‘𝐷))

Theoremodumeet 16963 Meets in a dual order are joins in the original. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &    = (join‘𝑂)        = (meet‘𝐷)

Theoremodulub 16964 Least upper bounds in a dual order are greatest lower bounds in the original order. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &   𝐿 = (glb‘𝑂)       (𝑂𝑉𝐿 = (lub‘𝐷))

Theoremodujoin 16965 Joins in a dual order are meets in the original. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)    &    = (meet‘𝑂)        = (join‘𝐷)

Theoremodulatb 16966 Being a lattice is self-dual. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)       (𝑂𝑉 → (𝑂 ∈ Lat ↔ 𝐷 ∈ Lat))

Theoremoduclatb 16967 Being a complete lattice is self-dual. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)       (𝑂 ∈ CLat ↔ 𝐷 ∈ CLat)

Theoremodulat 16968 Being a lattice is self-dual. (Contributed by Stefan O'Rear, 29-Jan-2015.)
𝐷 = (ODual‘𝑂)       (𝑂 ∈ Lat → 𝐷 ∈ Lat)

Theoremposlubmo 16969* Least upper bounds in a poset are unique if they exist. (Contributed by Stefan O'Rear, 31-Jan-2015.) (Revised by NM, 16-Jun-2017.)
= (le‘𝐾)    &   𝐵 = (Base‘𝐾)       ((𝐾 ∈ Poset ∧ 𝑆𝐵) → ∃*𝑥𝐵 (∀𝑦𝑆 𝑦 𝑥 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑦 𝑧𝑥 𝑧)))

Theoremposglbmo 16970* Greatest lower bounds in a poset are unique if they exist. (Contributed by NM, 20-Sep-2018.)
= (le‘𝐾)    &   𝐵 = (Base‘𝐾)       ((𝐾 ∈ Poset ∧ 𝑆𝐵) → ∃*𝑥𝐵 (∀𝑦𝑆 𝑥 𝑦 ∧ ∀𝑧𝐵 (∀𝑦𝑆 𝑧 𝑦𝑧 𝑥)))

Theoremposlubd 16971* Properties which determine the least upper bound in a poset. (Contributed by Stefan O'Rear, 31-Jan-2015.)
= (le‘𝐾)    &   𝐵 = (Base‘𝐾)    &   𝑈 = (lub‘𝐾)    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑆𝐵)    &   (𝜑𝑇𝐵)    &   ((𝜑𝑥𝑆) → 𝑥 𝑇)    &   ((𝜑𝑦𝐵 ∧ ∀𝑥𝑆 𝑥 𝑦) → 𝑇 𝑦)       (𝜑 → (𝑈𝑆) = 𝑇)

Theoremposlubdg 16972* Properties which determine the least upper bound in a poset. (Contributed by Stefan O'Rear, 31-Jan-2015.)
= (le‘𝐾)    &   (𝜑𝐵 = (Base‘𝐾))    &   (𝜑𝑈 = (lub‘𝐾))    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑆𝐵)    &   (𝜑𝑇𝐵)    &   ((𝜑𝑥𝑆) → 𝑥 𝑇)    &   ((𝜑𝑦𝐵 ∧ ∀𝑥𝑆 𝑥 𝑦) → 𝑇 𝑦)       (𝜑 → (𝑈𝑆) = 𝑇)

Theoremposglbd 16973* Properties which determine the greatest lower bound in a poset. (Contributed by Stefan O'Rear, 31-Jan-2015.)
= (le‘𝐾)    &   (𝜑𝐵 = (Base‘𝐾))    &   (𝜑𝐺 = (glb‘𝐾))    &   (𝜑𝐾 ∈ Poset)    &   (𝜑𝑆𝐵)    &   (𝜑𝑇𝐵)    &   ((𝜑𝑥𝑆) → 𝑇 𝑥)    &   ((𝜑𝑦𝐵 ∧ ∀𝑥𝑆 𝑦 𝑥) → 𝑦 𝑇)       (𝜑 → (𝐺𝑆) = 𝑇)

9.2.4  Subset order structures

Syntaxcipo 16974 Class function defining inclusion posets.
class toInc

Definitiondf-ipo 16975* For any family of sets, define the poset of that family ordered by inclusion. See ipobas 16978, ipolerval 16979, and ipole 16981 for its contract.

EDITORIAL: I'm not thrilled with the name. Any suggestions? (Contributed by Stefan O'Rear, 30-Jan-2015.) (New usage is discouraged.)

toInc = (𝑓 ∈ V ↦ {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝑓𝑥𝑦)} / 𝑜({⟨(Base‘ndx), 𝑓⟩, ⟨(TopSet‘ndx), (ordTop‘𝑜)⟩} ∪ {⟨(le‘ndx), 𝑜⟩, ⟨(oc‘ndx), (𝑥𝑓 {𝑦𝑓 ∣ (𝑦𝑥) = ∅})⟩}))

Theoremipostr 16976 The structure of df-ipo 16975 is a structure defining indexes up to 11. (Contributed by Mario Carneiro, 25-Oct-2015.)
({⟨(Base‘ndx), 𝐵⟩, ⟨(TopSet‘ndx), 𝐽⟩} ∪ {⟨(le‘ndx), ⟩, ⟨(oc‘ndx), ⟩}) Struct ⟨1, 11⟩

Theoremipoval 16977* Value of the inclusion poset. (Contributed by Stefan O'Rear, 30-Jan-2015.)
𝐼 = (toInc‘𝐹)    &    = {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝐹𝑥𝑦)}       (𝐹𝑉𝐼 = ({⟨(Base‘ndx), 𝐹⟩, ⟨(TopSet‘ndx), (ordTop‘ )⟩} ∪ {⟨(le‘ndx), ⟩, ⟨(oc‘ndx), (𝑥𝐹 {𝑦𝐹 ∣ (𝑦𝑥) = ∅})⟩}))

Theoremipobas 16978 Base set of the inclusion poset. (Contributed by Stefan O'Rear, 30-Jan-2015.) (Revised by Mario Carneiro, 25-Oct-2015.)
𝐼 = (toInc‘𝐹)       (𝐹𝑉𝐹 = (Base‘𝐼))

Theoremipolerval 16979* Relation of the inclusion poset. (Contributed by Stefan O'Rear, 30-Jan-2015.)
𝐼 = (toInc‘𝐹)       (𝐹𝑉 → {⟨𝑥, 𝑦⟩ ∣ ({𝑥, 𝑦} ⊆ 𝐹𝑥𝑦)} = (le‘𝐼))

Theoremipotset 16980 Topology of the inclusion poset. (Contributed by Mario Carneiro, 24-Oct-2015.)
𝐼 = (toInc‘𝐹)    &    = (le‘𝐼)       (𝐹𝑉 → (ordTop‘ ) = (TopSet‘𝐼))

Theoremipole 16981 Weak order condition of the inclusion poset. (Contributed by Stefan O'Rear, 30-Jan-2015.)
𝐼 = (toInc‘𝐹)    &    = (le‘𝐼)       ((𝐹𝑉𝑋𝐹𝑌𝐹) → (𝑋 𝑌𝑋𝑌))

Theoremipolt 16982 Strict order condition of the inclusion poset. (Contributed by Stefan O'Rear, 30-Jan-2015.)
𝐼 = (toInc‘𝐹)    &    < = (lt‘𝐼)       ((𝐹𝑉𝑋𝐹𝑌𝐹) → (𝑋 < 𝑌𝑋𝑌))

Theoremipopos 16983 The inclusion poset on a family of sets is actually a poset. (Contributed by Stefan O'Rear, 30-Jan-2015.)
𝐼 = (toInc‘𝐹)       𝐼 ∈ Poset

Theoremisipodrs 16984* Condition for a family of sets to be directed by inclusion. (Contributed by Stefan O'Rear, 2-Apr-2015.)
((toInc‘𝐴) ∈ Dirset ↔ (𝐴 ∈ V ∧ 𝐴 ≠ ∅ ∧ ∀𝑥𝐴𝑦𝐴𝑧𝐴 (𝑥𝑦) ⊆ 𝑧))

Theoremipodrscl 16985 Direction by inclusion as used here implies sethood. (Contributed by Stefan O'Rear, 2-Apr-2015.)
((toInc‘𝐴) ∈ Dirset → 𝐴 ∈ V)

Theoremipodrsfi 16986* Finite upper bound property for directed collections of sets. (Contributed by Stefan O'Rear, 2-Apr-2015.)
(((toInc‘𝐴) ∈ Dirset ∧ 𝑋𝐴𝑋 ∈ Fin) → ∃𝑧𝐴 𝑋𝑧)

Theoremfpwipodrs 16987 The finite subsets of any set are directed by inclusion. (Contributed by Stefan O'Rear, 2-Apr-2015.)
(𝐴𝑉 → (toInc‘(𝒫 𝐴 ∩ Fin)) ∈ Dirset)

Theoremipodrsima 16988* The monotone image of a directed set. (Contributed by Stefan O'Rear, 2-Apr-2015.)
(𝜑𝐹 Fn 𝒫 𝐴)    &   ((𝜑 ∧ (𝑢𝑣𝑣𝐴)) → (𝐹𝑢) ⊆ (𝐹𝑣))    &   (𝜑 → (toInc‘𝐵) ∈ Dirset)    &   (𝜑𝐵 ⊆ 𝒫 𝐴)    &   (𝜑 → (𝐹𝐵) ∈ 𝑉)       (𝜑 → (toInc‘(𝐹𝐵)) ∈ Dirset)

Theoremisacs3lem 16989* An algebraic closure system satisfies isacs3 16997. (Contributed by Stefan O'Rear, 2-Apr-2015.)
(𝐶 ∈ (ACS‘𝑋) → (𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑠 ∈ 𝒫 𝐶((toInc‘𝑠) ∈ Dirset → 𝑠𝐶)))

Theoremacsdrsel 16990 An algebraic closure system contains all directed unions of closed sets. (Contributed by Stefan O'Rear, 2-Apr-2015.)
((𝐶 ∈ (ACS‘𝑋) ∧ 𝑌𝐶 ∧ (toInc‘𝑌) ∈ Dirset) → 𝑌𝐶)

Theoremisacs4lem 16991* In a closure system in which directed unions of closed sets are closed, closure commutes with directed unions. (Contributed by Stefan O'Rear, 2-Apr-2015.)
𝐹 = (mrCls‘𝐶)       ((𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑠 ∈ 𝒫 𝐶((toInc‘𝑠) ∈ Dirset → 𝑠𝐶)) → (𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑡 ∈ 𝒫 𝒫 𝑋((toInc‘𝑡) ∈ Dirset → (𝐹 𝑡) = (𝐹𝑡))))

Theoremisacs5lem 16992* If closure commutes with directed unions, then the closure of a set is the closure of its finite subsets. (Contributed by Stefan O'Rear, 2-Apr-2015.)
𝐹 = (mrCls‘𝐶)       ((𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑡 ∈ 𝒫 𝒫 𝑋((toInc‘𝑡) ∈ Dirset → (𝐹 𝑡) = (𝐹𝑡))) → (𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑠 ∈ 𝒫 𝑋(𝐹𝑠) = (𝐹 “ (𝒫 𝑠 ∩ Fin))))

Theoremacsdrscl 16993 In an algebraic closure system, closure commutes with directed unions. (Contributed by Stefan O'Rear, 2-Apr-2015.)
𝐹 = (mrCls‘𝐶)       ((𝐶 ∈ (ACS‘𝑋) ∧ 𝑌 ⊆ 𝒫 𝑋 ∧ (toInc‘𝑌) ∈ Dirset) → (𝐹 𝑌) = (𝐹𝑌))

Theoremacsficl 16994 A closure in an algebraic closure system is the union of the closures of finite subsets. (Contributed by Stefan O'Rear, 2-Apr-2015.)
𝐹 = (mrCls‘𝐶)       ((𝐶 ∈ (ACS‘𝑋) ∧ 𝑆𝑋) → (𝐹𝑆) = (𝐹 “ (𝒫 𝑆 ∩ Fin)))

Theoremisacs5 16995* A closure system is algebraic iff the closure of a generating set is the union of the closures of its finite subsets. (Contributed by Stefan O'Rear, 2-Apr-2015.)
𝐹 = (mrCls‘𝐶)       (𝐶 ∈ (ACS‘𝑋) ↔ (𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑠 ∈ 𝒫 𝑋(𝐹𝑠) = (𝐹 “ (𝒫 𝑠 ∩ Fin))))

Theoremisacs4 16996* A closure system is algebraic iff closure commutes with directed unions. (Contributed by Stefan O'Rear, 2-Apr-2015.)
𝐹 = (mrCls‘𝐶)       (𝐶 ∈ (ACS‘𝑋) ↔ (𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑠 ∈ 𝒫 𝒫 𝑋((toInc‘𝑠) ∈ Dirset → (𝐹 𝑠) = (𝐹𝑠))))

Theoremisacs3 16997* A closure system is algebraic iff directed unions of closed sets are closed. (Contributed by Stefan O'Rear, 2-Apr-2015.)
(𝐶 ∈ (ACS‘𝑋) ↔ (𝐶 ∈ (Moore‘𝑋) ∧ ∀𝑠 ∈ 𝒫 𝐶((toInc‘𝑠) ∈ Dirset → 𝑠𝐶)))

Theoremacsficld 16998 In an algebraic closure system, the closure of a set is the union of the closures of its finite subsets. Deduction form of acsficl 16994. (Contributed by David Moews, 1-May-2017.)
(𝜑𝐴 ∈ (ACS‘𝑋))    &   𝑁 = (mrCls‘𝐴)    &   (𝜑𝑆𝑋)       (𝜑 → (𝑁𝑆) = (𝑁 “ (𝒫 𝑆 ∩ Fin)))

Theoremacsficl2d 16999* In an algebraic closure system, an element is in the closure of a set if and only if it is in the closure of a finite subset. Alternate form of acsficl 16994. Deduction form. (Contributed by David Moews, 1-May-2017.)
(𝜑𝐴 ∈ (ACS‘𝑋))    &   𝑁 = (mrCls‘𝐴)    &   (𝜑𝑆𝑋)       (𝜑 → (𝑌 ∈ (𝑁𝑆) ↔ ∃𝑥 ∈ (𝒫 𝑆 ∩ Fin)𝑌 ∈ (𝑁𝑥)))

Theoremacsfiindd 17000 In an algebraic closure system, a set is independent if and only if all its finite subsets are independent. Part of Proposition 4.1.3 in [FaureFrolicher] p. 83. (Contributed by David Moews, 1-May-2017.)
(𝜑𝐴 ∈ (ACS‘𝑋))    &   𝑁 = (mrCls‘𝐴)    &   𝐼 = (mrInd‘𝐴)    &   (𝜑𝑆𝑋)       (𝜑 → (𝑆𝐼 ↔ (𝒫 𝑆 ∩ Fin) ⊆ 𝐼))

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206 20501-20600 207 20601-20700 208 20701-20800 209 20801-20900 210 20901-21000 211 21001-21100 212 21101-21200 213 21201-21300 214 21301-21400 215 21401-21500 216 21501-21600 217 21601-21700 218 21701-21800 219 21801-21900 220 21901-22000 221 22001-22100 222 22101-22200 223 22201-22300 224 22301-22400 225 22401-22500 226 22501-22600 227 22601-22700 228 22701-22800 229 22801-22900 230 22901-23000 231 23001-23100 232 23101-23200 233 23201-23300 234 23301-23400 235 23401-23500 236 23501-23600 237 23601-23700 238 23701-23800 239 23801-23900 240 23901-24000 241 24001-24100 242 24101-24200 243 24201-24300 244 24301-24400 245 24401-24500 246 24501-24600 247 24601-24700 248 24701-24800 249 24801-24900 250 24901-25000 251 25001-25100 252 25101-25200 253 25201-25300 254 25301-25400 255 25401-25500 256 25501-25600 257 25601-25700 258 25701-25800 259 25801-25900 260 25901-26000 261 26001-26100 262 26101-26200 263 26201-26300 264 26301-26400 265 26401-26500 266 26501-26600 267 26601-26700 268 26701-26800 269 26801-26900 270 26901-27000 271 27001-27100 272 27101-27200 273 27201-27300 274 27301-27400 275 27401-27500 276 27501-27600 277 27601-27700 278 27701-27800 279 27801-27900 280 27901-28000 281 28001-28100 282 28101-28200 283 28201-28300 284 28301-28400 285 28401-28500 286 28501-28600 287 28601-28700 288 28701-28800 289 28801-28900 290 28901-29000 291 29001-29100 292 29101-29200 293 29201-29300 294 29301-29400 295 29401-29500 296 29501-29600 297 29601-29700 298 29701-29800 299 29801-29900 300 29901-30000 301 30001-30100 302 30101-30200 303 30201-30300 304 30301-30400 305 30401-30500 306 30501-30600 307 30601-30700 308 30701-30800 309 30801-30900 310 30901-31000 311 31001-31100 312 31101-31200 313 31201-31300 314 31301-31400 315 31401-31500 316 31501-31600 317 31601-31700 318 31701-31800 319 31801-31900 320 31901-32000 321 32001-32100 322 32101-32200 323 32201-32300 324 32301-32400 325 32401-32500 326 32501-32600 327 32601-32700 328 32701-32800 329 32801-32900 330 32901-33000 331 33001-33100 332 33101-33200 333 33201-33300 334 33301-33400 335 33401-33500 336 33501-33600 337 33601-33700 338 33701-33800 339 33801-33900 340 33901-34000 341 34001-34100 342 34101-34200 343 34201-34300 344 34301-34400 345 34401-34500 346 34501-34600 347 34601-34700 348 34701-34800 349 34801-34900 350 34901-35000 351 35001-35100 352 35101-35200 353 35201-35300 354 35301-35400 355 35401-35500 356 35501-35600 357 35601-35700 358 35701-35800 359 35801-35900 360 35901-36000 361 36001-36100 362 36101-36200 363 36201-36300 364 36301-36400 365 36401-36500 366 36501-36600 367 36601-36700 368 36701-36800 369 36801-36900 370 36901-37000 371 37001-37100 372 37101-37200 373 37201-37300 374 37301-37400 375 37401-37500 376 37501-37600 377 37601-37700 378 37701-37800 379 37801-37900 380 37901-38000 381 38001-38100 382 38101-38200 383 38201-38300 384 38301-38400 385 38401-38500 386 38501-38600 387 38601-38700 388 38701-38800 389 38801-38900 390 38901-39000 391 39001-39100 392 39101-39200 393 39201-39300 394 39301-39400 395 39401-39500 396 39501-39600 397 39601-39700 398 39701-39800 399 39801-39900 400 39901-40000 401 40001-40100 402 40101-40200 403 40201-40300 404 40301-40400 405 40401-40500 406 40501-40600 407 40601-40700 408 40701-40800 409 40801-40900 410 40901-41000 411 41001-41100 412 41101-41200 413 41201-41300 414 41301-41400 415 41401-41500 416 41501-41600 417 41601-41700 418 41701-41800 419 41801-41900 420 41901-42000 421 42001-42100 422 42101-42200 423 42201-42300 424 42301-42360
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