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| Mirrors > Home > MPE Home > Th. List > Mathboxes > cicrcl2 | Structured version Visualization version GIF version | ||
| Description: Isomorphism implies the structure being a category. (Contributed by Zhi Wang, 26-Oct-2025.) |
| Ref | Expression |
|---|---|
| cicrcl2 | ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 → 𝐶 ∈ Cat) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-br 5110 | . 2 ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 ↔ 〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶)) | |
| 2 | elfvdm 6915 | . . 3 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ dom ≃𝑐 ) | |
| 3 | cicfn 49820 | . . . 4 ⊢ ≃𝑐 Fn Cat | |
| 4 | 3 | fndmi 6639 | . . 3 ⊢ dom ≃𝑐 = Cat |
| 5 | 2, 4 | eleqtrdi 2873 | . 2 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ Cat) |
| 6 | 1, 5 | sylbi 220 | 1 ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 → 𝐶 ∈ Cat) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2143 〈cop 4595 class class class wbr 5109 dom cdm 5661 ‘cfv 6536 Catccat 17715 ≃𝑐 ccic 17847 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pr 5404 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-mpt 5193 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-iota 6492 df-fun 6538 df-fn 6539 df-fv 6544 df-ov 7413 df-cic 17848 |
| This theorem is referenced by: oppccic 49822 cicpropdlem 49827 termfucterm 50322 |
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