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Theorem isoval 16341
Description: The isomorphisms are the domain of the inverse relation. (Contributed by Mario Carneiro, 2-Jan-2017.) (Proof shortened by AV, 21-May-2020.)
Hypotheses
Ref Expression
invfval.b 𝐵 = (Base‘𝐶)
invfval.n 𝑁 = (Inv‘𝐶)
invfval.c (𝜑𝐶 ∈ Cat)
invfval.x (𝜑𝑋𝐵)
invfval.y (𝜑𝑌𝐵)
isoval.n 𝐼 = (Iso‘𝐶)
Assertion
Ref Expression
isoval (𝜑 → (𝑋𝐼𝑌) = dom (𝑋𝑁𝑌))

Proof of Theorem isoval
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 invfval.c . . . . 5 (𝜑𝐶 ∈ Cat)
2 isofval 16333 . . . . 5 (𝐶 ∈ Cat → (Iso‘𝐶) = ((𝑧 ∈ V ↦ dom 𝑧) ∘ (Inv‘𝐶)))
31, 2syl 17 . . . 4 (𝜑 → (Iso‘𝐶) = ((𝑧 ∈ V ↦ dom 𝑧) ∘ (Inv‘𝐶)))
4 isoval.n . . . 4 𝐼 = (Iso‘𝐶)
5 invfval.n . . . . 5 𝑁 = (Inv‘𝐶)
65coeq2i 5247 . . . 4 ((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁) = ((𝑧 ∈ V ↦ dom 𝑧) ∘ (Inv‘𝐶))
73, 4, 63eqtr4g 2685 . . 3 (𝜑𝐼 = ((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁))
87oveqd 6622 . 2 (𝜑 → (𝑋𝐼𝑌) = (𝑋((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁)𝑌))
9 eqid 2626 . . . . . 6 (𝑥𝐵, 𝑦𝐵 ↦ ((𝑥(Sect‘𝐶)𝑦) ∩ (𝑦(Sect‘𝐶)𝑥))) = (𝑥𝐵, 𝑦𝐵 ↦ ((𝑥(Sect‘𝐶)𝑦) ∩ (𝑦(Sect‘𝐶)𝑥)))
10 ovex 6633 . . . . . . 7 (𝑥(Sect‘𝐶)𝑦) ∈ V
1110inex1 4764 . . . . . 6 ((𝑥(Sect‘𝐶)𝑦) ∩ (𝑦(Sect‘𝐶)𝑥)) ∈ V
129, 11fnmpt2i 7185 . . . . 5 (𝑥𝐵, 𝑦𝐵 ↦ ((𝑥(Sect‘𝐶)𝑦) ∩ (𝑦(Sect‘𝐶)𝑥))) Fn (𝐵 × 𝐵)
13 invfval.b . . . . . . 7 𝐵 = (Base‘𝐶)
14 invfval.x . . . . . . 7 (𝜑𝑋𝐵)
15 invfval.y . . . . . . 7 (𝜑𝑌𝐵)
16 eqid 2626 . . . . . . 7 (Sect‘𝐶) = (Sect‘𝐶)
1713, 5, 1, 14, 15, 16invffval 16334 . . . . . 6 (𝜑𝑁 = (𝑥𝐵, 𝑦𝐵 ↦ ((𝑥(Sect‘𝐶)𝑦) ∩ (𝑦(Sect‘𝐶)𝑥))))
1817fneq1d 5941 . . . . 5 (𝜑 → (𝑁 Fn (𝐵 × 𝐵) ↔ (𝑥𝐵, 𝑦𝐵 ↦ ((𝑥(Sect‘𝐶)𝑦) ∩ (𝑦(Sect‘𝐶)𝑥))) Fn (𝐵 × 𝐵)))
1912, 18mpbiri 248 . . . 4 (𝜑𝑁 Fn (𝐵 × 𝐵))
20 opelxpi 5113 . . . . 5 ((𝑋𝐵𝑌𝐵) → ⟨𝑋, 𝑌⟩ ∈ (𝐵 × 𝐵))
2114, 15, 20syl2anc 692 . . . 4 (𝜑 → ⟨𝑋, 𝑌⟩ ∈ (𝐵 × 𝐵))
22 fvco2 6231 . . . 4 ((𝑁 Fn (𝐵 × 𝐵) ∧ ⟨𝑋, 𝑌⟩ ∈ (𝐵 × 𝐵)) → (((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁)‘⟨𝑋, 𝑌⟩) = ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑁‘⟨𝑋, 𝑌⟩)))
2319, 21, 22syl2anc 692 . . 3 (𝜑 → (((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁)‘⟨𝑋, 𝑌⟩) = ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑁‘⟨𝑋, 𝑌⟩)))
24 df-ov 6608 . . 3 (𝑋((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁)𝑌) = (((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁)‘⟨𝑋, 𝑌⟩)
25 ovex 6633 . . . . 5 (𝑋𝑁𝑌) ∈ V
26 dmeq 5289 . . . . . 6 (𝑧 = (𝑋𝑁𝑌) → dom 𝑧 = dom (𝑋𝑁𝑌))
27 eqid 2626 . . . . . 6 (𝑧 ∈ V ↦ dom 𝑧) = (𝑧 ∈ V ↦ dom 𝑧)
2825dmex 7047 . . . . . 6 dom (𝑋𝑁𝑌) ∈ V
2926, 27, 28fvmpt 6240 . . . . 5 ((𝑋𝑁𝑌) ∈ V → ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑋𝑁𝑌)) = dom (𝑋𝑁𝑌))
3025, 29ax-mp 5 . . . 4 ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑋𝑁𝑌)) = dom (𝑋𝑁𝑌)
31 df-ov 6608 . . . . 5 (𝑋𝑁𝑌) = (𝑁‘⟨𝑋, 𝑌⟩)
3231fveq2i 6153 . . . 4 ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑋𝑁𝑌)) = ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑁‘⟨𝑋, 𝑌⟩))
3330, 32eqtr3i 2650 . . 3 dom (𝑋𝑁𝑌) = ((𝑧 ∈ V ↦ dom 𝑧)‘(𝑁‘⟨𝑋, 𝑌⟩))
3423, 24, 333eqtr4g 2685 . 2 (𝜑 → (𝑋((𝑧 ∈ V ↦ dom 𝑧) ∘ 𝑁)𝑌) = dom (𝑋𝑁𝑌))
358, 34eqtrd 2660 1 (𝜑 → (𝑋𝐼𝑌) = dom (𝑋𝑁𝑌))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1480  wcel 1992  Vcvv 3191  cin 3559  cop 4159  cmpt 4678   × cxp 5077  ccnv 5078  dom cdm 5079  ccom 5083   Fn wfn 5845  cfv 5850  (class class class)co 6605  cmpt2 6607  Basecbs 15776  Catccat 16241  Sectcsect 16320  Invcinv 16321  Isociso 16322
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1841  ax-6 1890  ax-7 1937  ax-8 1994  ax-9 2001  ax-10 2021  ax-11 2036  ax-12 2049  ax-13 2250  ax-ext 2606  ax-rep 4736  ax-sep 4746  ax-nul 4754  ax-pow 4808  ax-pr 4872  ax-un 6903
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1883  df-eu 2478  df-mo 2479  df-clab 2613  df-cleq 2619  df-clel 2622  df-nfc 2756  df-ne 2797  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3193  df-sbc 3423  df-csb 3520  df-dif 3563  df-un 3565  df-in 3567  df-ss 3574  df-nul 3897  df-if 4064  df-pw 4137  df-sn 4154  df-pr 4156  df-op 4160  df-uni 4408  df-iun 4492  df-br 4619  df-opab 4679  df-mpt 4680  df-id 4994  df-xp 5085  df-rel 5086  df-cnv 5087  df-co 5088  df-dm 5089  df-rn 5090  df-res 5091  df-ima 5092  df-iota 5813  df-fun 5852  df-fn 5853  df-f 5854  df-f1 5855  df-fo 5856  df-f1o 5857  df-fv 5858  df-ov 6608  df-oprab 6609  df-mpt2 6610  df-1st 7116  df-2nd 7117  df-inv 16324  df-iso 16325
This theorem is referenced by:  inviso1  16342  invf  16344  invco  16347  dfiso2  16348  isohom  16352  oppciso  16357  cicsym  16380  funciso  16450  ffthiso  16505  fuciso  16551  setciso  16657  catciso  16673  rngciso  41243  rngcisoALTV  41255  ringciso  41294  ringcisoALTV  41318
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