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Theorem cicrcl2 49701
Description: Isomorphism implies the structure being a category. (Contributed by Zhi Wang, 26-Oct-2025.)
Assertion
Ref Expression
cicrcl2 (𝑅( ≃𝑐𝐶)𝑆𝐶 ∈ Cat)

Proof of Theorem cicrcl2
StepHypRef Expression
1 df-br 5111 . 2 (𝑅( ≃𝑐𝐶)𝑆 ↔ ⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶))
2 elfvdm 6913 . . 3 (⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶) → 𝐶 ∈ dom ≃𝑐 )
3 cicfn 49700 . . . 4 𝑐 Fn Cat
43fndmi 6637 . . 3 dom ≃𝑐 = Cat
52, 4eleqtrdi 2879 . 2 (⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶) → 𝐶 ∈ Cat)
61, 5sylbi 220 1 (𝑅( ≃𝑐𝐶)𝑆𝐶 ∈ Cat)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2149  cop 4597   class class class wbr 5110  dom cdm 5659  cfv 6534  Catccat 17716  𝑐 ccic 17848
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5258  ax-nul 5268  ax-pr 5402
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4874  df-br 5111  df-opab 5175  df-mpt 5194  df-id 5554  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-iota 6490  df-fun 6536  df-fn 6537  df-fv 6542  df-ov 7411  df-cic 17849
This theorem is referenced by:  oppccic  49702  cicpropdlem  49707  termfucterm  50202
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