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Theorem mgcf1olem2 32677
Description: Property of a Galois connection, lemma for mgcf1o 32678. (Contributed by Thierry Arnoux, 26-Jul-2024.)
Hypotheses
Ref Expression
mgcf1o.h 𝐻 = (𝑉MGalConnπ‘Š)
mgcf1o.a 𝐴 = (Baseβ€˜π‘‰)
mgcf1o.b 𝐡 = (Baseβ€˜π‘Š)
mgcf1o.1 ≀ = (leβ€˜π‘‰)
mgcf1o.2 ≲ = (leβ€˜π‘Š)
mgcf1o.v (πœ‘ β†’ 𝑉 ∈ Poset)
mgcf1o.w (πœ‘ β†’ π‘Š ∈ Poset)
mgcf1o.f (πœ‘ β†’ 𝐹𝐻𝐺)
mgcf1olem2.1 (πœ‘ β†’ π‘Œ ∈ 𝐡)
Assertion
Ref Expression
mgcf1olem2 (πœ‘ β†’ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) = (πΊβ€˜π‘Œ))

Proof of Theorem mgcf1olem2
Dummy variables 𝑒 𝑣 π‘₯ 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mgcf1o.v . 2 (πœ‘ β†’ 𝑉 ∈ Poset)
2 mgcf1o.f . . . . 5 (πœ‘ β†’ 𝐹𝐻𝐺)
3 mgcf1o.a . . . . . 6 𝐴 = (Baseβ€˜π‘‰)
4 mgcf1o.b . . . . . 6 𝐡 = (Baseβ€˜π‘Š)
5 mgcf1o.1 . . . . . 6 ≀ = (leβ€˜π‘‰)
6 mgcf1o.2 . . . . . 6 ≲ = (leβ€˜π‘Š)
7 mgcf1o.h . . . . . 6 𝐻 = (𝑉MGalConnπ‘Š)
8 posprs 18281 . . . . . . 7 (𝑉 ∈ Poset β†’ 𝑉 ∈ Proset )
91, 8syl 17 . . . . . 6 (πœ‘ β†’ 𝑉 ∈ Proset )
10 mgcf1o.w . . . . . . 7 (πœ‘ β†’ π‘Š ∈ Poset)
11 posprs 18281 . . . . . . 7 (π‘Š ∈ Poset β†’ π‘Š ∈ Proset )
1210, 11syl 17 . . . . . 6 (πœ‘ β†’ π‘Š ∈ Proset )
133, 4, 5, 6, 7, 9, 12dfmgc2 32671 . . . . 5 (πœ‘ β†’ (𝐹𝐻𝐺 ↔ ((𝐹:𝐴⟢𝐡 ∧ 𝐺:𝐡⟢𝐴) ∧ ((βˆ€π‘₯ ∈ 𝐴 βˆ€π‘¦ ∈ 𝐴 (π‘₯ ≀ 𝑦 β†’ (πΉβ€˜π‘₯) ≲ (πΉβ€˜π‘¦)) ∧ βˆ€π‘’ ∈ 𝐡 βˆ€π‘£ ∈ 𝐡 (𝑒 ≲ 𝑣 β†’ (πΊβ€˜π‘’) ≀ (πΊβ€˜π‘£))) ∧ (βˆ€π‘’ ∈ 𝐡 (πΉβ€˜(πΊβ€˜π‘’)) ≲ 𝑒 ∧ βˆ€π‘₯ ∈ 𝐴 π‘₯ ≀ (πΊβ€˜(πΉβ€˜π‘₯)))))))
142, 13mpbid 231 . . . 4 (πœ‘ β†’ ((𝐹:𝐴⟢𝐡 ∧ 𝐺:𝐡⟢𝐴) ∧ ((βˆ€π‘₯ ∈ 𝐴 βˆ€π‘¦ ∈ 𝐴 (π‘₯ ≀ 𝑦 β†’ (πΉβ€˜π‘₯) ≲ (πΉβ€˜π‘¦)) ∧ βˆ€π‘’ ∈ 𝐡 βˆ€π‘£ ∈ 𝐡 (𝑒 ≲ 𝑣 β†’ (πΊβ€˜π‘’) ≀ (πΊβ€˜π‘£))) ∧ (βˆ€π‘’ ∈ 𝐡 (πΉβ€˜(πΊβ€˜π‘’)) ≲ 𝑒 ∧ βˆ€π‘₯ ∈ 𝐴 π‘₯ ≀ (πΊβ€˜(πΉβ€˜π‘₯))))))
1514simplrd 767 . . 3 (πœ‘ β†’ 𝐺:𝐡⟢𝐴)
1614simplld 765 . . . 4 (πœ‘ β†’ 𝐹:𝐴⟢𝐡)
17 mgcf1olem2.1 . . . . 5 (πœ‘ β†’ π‘Œ ∈ 𝐡)
1815, 17ffvelcdmd 7081 . . . 4 (πœ‘ β†’ (πΊβ€˜π‘Œ) ∈ 𝐴)
1916, 18ffvelcdmd 7081 . . 3 (πœ‘ β†’ (πΉβ€˜(πΊβ€˜π‘Œ)) ∈ 𝐡)
2015, 19ffvelcdmd 7081 . 2 (πœ‘ β†’ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) ∈ 𝐴)
213, 4, 5, 6, 7, 9, 12, 2, 17mgccole2 32666 . . 3 (πœ‘ β†’ (πΉβ€˜(πΊβ€˜π‘Œ)) ≲ π‘Œ)
223, 4, 5, 6, 7, 9, 12, 2, 19, 17, 21mgcmnt2 32668 . 2 (πœ‘ β†’ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) ≀ (πΊβ€˜π‘Œ))
233, 4, 5, 6, 7, 9, 12, 2, 18mgccole1 32665 . 2 (πœ‘ β†’ (πΊβ€˜π‘Œ) ≀ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))))
243, 5posasymb 18284 . . 3 ((𝑉 ∈ Poset ∧ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) ∈ 𝐴 ∧ (πΊβ€˜π‘Œ) ∈ 𝐴) β†’ (((πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) ≀ (πΊβ€˜π‘Œ) ∧ (πΊβ€˜π‘Œ) ≀ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ)))) ↔ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) = (πΊβ€˜π‘Œ)))
2524biimpa 476 . 2 (((𝑉 ∈ Poset ∧ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) ∈ 𝐴 ∧ (πΊβ€˜π‘Œ) ∈ 𝐴) ∧ ((πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) ≀ (πΊβ€˜π‘Œ) ∧ (πΊβ€˜π‘Œ) ≀ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))))) β†’ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) = (πΊβ€˜π‘Œ))
261, 20, 18, 22, 23, 25syl32anc 1375 1 (πœ‘ β†’ (πΊβ€˜(πΉβ€˜(πΊβ€˜π‘Œ))) = (πΊβ€˜π‘Œ))
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   ∧ wa 395   ∧ w3a 1084   = wceq 1533   ∈ wcel 2098  βˆ€wral 3055   class class class wbr 5141  βŸΆwf 6533  β€˜cfv 6537  (class class class)co 7405  Basecbs 17153  lecple 17213   Proset cproset 18258  Posetcpo 18272  MGalConncmgc 32654
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2697  ax-sep 5292  ax-nul 5299  ax-pow 5356  ax-pr 5420  ax-un 7722
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2528  df-eu 2557  df-clab 2704  df-cleq 2718  df-clel 2804  df-nfc 2879  df-ne 2935  df-ral 3056  df-rex 3065  df-rab 3427  df-v 3470  df-sbc 3773  df-csb 3889  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-pw 4599  df-sn 4624  df-pr 4626  df-op 4630  df-uni 4903  df-br 5142  df-opab 5204  df-id 5567  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-iota 6489  df-fun 6539  df-fn 6540  df-f 6541  df-fv 6545  df-ov 7408  df-oprab 7409  df-mpo 7410  df-map 8824  df-proset 18260  df-poset 18278  df-mgc 32656
This theorem is referenced by:  mgcf1o  32678
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