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Theorem cicrcl2 49530
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 5087 . 2 (𝑅( ≃𝑐𝐶)𝑆 ↔ ⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶))
2 elfvdm 6868 . . 3 (⟨𝑅, 𝑆⟩ ∈ ( ≃𝑐𝐶) → 𝐶 ∈ dom ≃𝑐 )
3 cicfn 49529 . . . 4 𝑐 Fn Cat
43fndmi 6596 . . 3 dom ≃𝑐 = Cat
52, 4eleqtrdi 2847 . 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 4574   class class class wbr 5086  dom cdm 5624  cfv 6492  Catccat 17621  𝑐 ccic 17753
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 2709  ax-sep 5231  ax-nul 5241  ax-pr 5370
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 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-iota 6448  df-fun 6494  df-fn 6495  df-fv 6500  df-ov 7363  df-cic 17754
This theorem is referenced by:  oppccic  49531  cicpropdlem  49536  termfucterm  50031
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