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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 5087 | . 2 ⊢ (𝑅( ≃𝑐 ‘𝐶)𝑆 ↔ 〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶)) | |
| 2 | elfvdm 6868 | . . 3 ⊢ (〈𝑅, 𝑆〉 ∈ ( ≃𝑐 ‘𝐶) → 𝐶 ∈ dom ≃𝑐 ) | |
| 3 | cicfn 49529 | . . . 4 ⊢ ≃𝑐 Fn Cat | |
| 4 | 3 | fndmi 6596 | . . 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 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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