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Theorem mgcf2 32154
Description: The upper adjoint 𝐺 of a Galois connection is a function. (Contributed by Thierry Arnoux, 24-Apr-2024.)
Hypotheses
Ref Expression
mgcoval.1 𝐴 = (Baseβ€˜π‘‰)
mgcoval.2 𝐡 = (Baseβ€˜π‘Š)
mgcoval.3 ≀ = (leβ€˜π‘‰)
mgcoval.4 ≲ = (leβ€˜π‘Š)
mgcval.1 𝐻 = (𝑉MGalConnπ‘Š)
mgcval.2 (πœ‘ β†’ 𝑉 ∈ Proset )
mgcval.3 (πœ‘ β†’ π‘Š ∈ Proset )
mgccole.1 (πœ‘ β†’ 𝐹𝐻𝐺)
Assertion
Ref Expression
mgcf2 (πœ‘ β†’ 𝐺:𝐡⟢𝐴)

Proof of Theorem mgcf2
Dummy variables π‘₯ 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mgccole.1 . . 3 (πœ‘ β†’ 𝐹𝐻𝐺)
2 mgcoval.1 . . . 4 𝐴 = (Baseβ€˜π‘‰)
3 mgcoval.2 . . . 4 𝐡 = (Baseβ€˜π‘Š)
4 mgcoval.3 . . . 4 ≀ = (leβ€˜π‘‰)
5 mgcoval.4 . . . 4 ≲ = (leβ€˜π‘Š)
6 mgcval.1 . . . 4 𝐻 = (𝑉MGalConnπ‘Š)
7 mgcval.2 . . . 4 (πœ‘ β†’ 𝑉 ∈ Proset )
8 mgcval.3 . . . 4 (πœ‘ β†’ π‘Š ∈ Proset )
92, 3, 4, 5, 6, 7, 8mgcval 32152 . . 3 (πœ‘ β†’ (𝐹𝐻𝐺 ↔ ((𝐹:𝐴⟢𝐡 ∧ 𝐺:𝐡⟢𝐴) ∧ βˆ€π‘₯ ∈ 𝐴 βˆ€π‘¦ ∈ 𝐡 ((πΉβ€˜π‘₯) ≲ 𝑦 ↔ π‘₯ ≀ (πΊβ€˜π‘¦)))))
101, 9mpbid 231 . 2 (πœ‘ β†’ ((𝐹:𝐴⟢𝐡 ∧ 𝐺:𝐡⟢𝐴) ∧ βˆ€π‘₯ ∈ 𝐴 βˆ€π‘¦ ∈ 𝐡 ((πΉβ€˜π‘₯) ≲ 𝑦 ↔ π‘₯ ≀ (πΊβ€˜π‘¦))))
1110simplrd 768 1 (πœ‘ β†’ 𝐺:𝐡⟢𝐴)
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   ↔ wb 205   ∧ wa 396   = wceq 1541   ∈ wcel 2106  βˆ€wral 3061   class class class wbr 5148  βŸΆwf 6539  β€˜cfv 6543  (class class class)co 7408  Basecbs 17143  lecple 17203   Proset cproset 18245  MGalConncmgc 32144
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7724
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-br 5149  df-opab 5211  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-fv 6551  df-ov 7411  df-oprab 7412  df-mpo 7413  df-map 8821  df-mgc 32146
This theorem is referenced by:  mgcmntco  32159  mgcmnt2d  32163
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