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Theorem cicrcl2 49518
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 5086 . 2 (𝑅( ≃𝑐𝐶)𝑆 ↔ ⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶))
2 elfvdm 6874 . . 3 (⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶) → 𝐶 ∈ dom ≃𝑐 )
3 cicfn 49517 . . . 4 𝑐 Fn Cat
43fndmi 6602 . . 3 dom ≃𝑐 = Cat
52, 4eleqtrdi 2846 . 2 (⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶) → 𝐶 ∈ Cat)
61, 5sylbi 217 1 (𝑅( ≃𝑐𝐶)𝑆𝐶 ∈ Cat)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2114  cop 4573   class class class wbr 5085  dom cdm 5631  cfv 6498  Catccat 17630  𝑐 ccic 17762
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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pr 5375
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-iota 6454  df-fun 6500  df-fn 6501  df-fv 6506  df-ov 7370  df-cic 17763
This theorem is referenced by:  oppccic  49519  cicpropdlem  49524  termfucterm  50019
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