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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 5101 | . 2 ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 ↔ 〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶)) | |
| 2 | elfvdm 6876 | . . 3 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ dom ≃𝑐 ) | |
| 3 | cicfn 49401 | . . . 4 ⊢ ≃𝑐 Fn Cat | |
| 4 | 3 | fndmi 6604 | . . 3 ⊢ dom ≃𝑐 = Cat |
| 5 | 2, 4 | eleqtrdi 2847 | . 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 2114 〈cop 4588 class class class wbr 5100 dom cdm 5632 ‘cfv 6500 Catccat 17599 ≃𝑐 ccic 17731 |
| 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 5243 ax-nul 5253 ax-pr 5379 |
| 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 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-iota 6456 df-fun 6502 df-fn 6503 df-fv 6508 df-ov 7371 df-cic 17732 |
| This theorem is referenced by: oppccic 49403 cicpropdlem 49408 termfucterm 49903 |
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