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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 5096 | . 2 ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 ↔ 〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶)) | |
| 2 | elfvdm 6865 | . . 3 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ dom ≃𝑐 ) | |
| 3 | cicfn 49203 | . . . 4 ⊢ ≃𝑐 Fn Cat | |
| 4 | 3 | fndmi 6593 | . . 3 ⊢ dom ≃𝑐 = Cat |
| 5 | 2, 4 | eleqtrdi 2843 | . 2 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ Cat) |
| 6 | 1, 5 | sylbi 217 | 1 ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 → 𝐶 ∈ Cat) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2113 〈cop 4583 class class class wbr 5095 dom cdm 5621 ‘cfv 6489 Catccat 17578 ≃𝑐 ccic 17710 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-sep 5238 ax-nul 5248 ax-pr 5374 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2882 df-ne 2930 df-ral 3049 df-rex 3058 df-rab 3397 df-v 3439 df-dif 3901 df-un 3903 df-ss 3915 df-nul 4283 df-if 4477 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-br 5096 df-opab 5158 df-mpt 5177 df-id 5516 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-iota 6445 df-fun 6491 df-fn 6492 df-fv 6497 df-ov 7358 df-cic 17711 |
| This theorem is referenced by: oppccic 49205 cicpropdlem 49210 termfucterm 49705 |
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