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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 6897 | . . 3 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ dom ≃𝑐 ) | |
| 3 | cicfn 49019 | . . . 4 ⊢ ≃𝑐 Fn Cat | |
| 4 | 3 | fndmi 6624 | . . 3 ⊢ dom ≃𝑐 = Cat |
| 5 | 2, 4 | eleqtrdi 2839 | . 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 2109 〈cop 4597 class class class wbr 5109 dom cdm 5640 ‘cfv 6513 Catccat 17631 ≃𝑐 ccic 17763 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5253 ax-nul 5263 ax-pr 5389 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-dif 3919 df-un 3921 df-ss 3933 df-nul 4299 df-if 4491 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-br 5110 df-opab 5172 df-mpt 5191 df-id 5535 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-iota 6466 df-fun 6515 df-fn 6516 df-fv 6521 df-ov 7392 df-cic 17764 |
| This theorem is referenced by: oppccic 49021 cicpropdlem 49026 termfucterm 49513 |
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