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| Mirrors > Home > MPE Home > Th. List > invid | Structured version Visualization version GIF version | ||
| Description: The inverse of the identity is the identity. (Contributed by AV, 8-Apr-2020.) |
| Ref | Expression |
|---|---|
| invid.b | ⊢ 𝐵 = (Base‘𝐶) |
| invid.i | ⊢ 𝐼 = (Id‘𝐶) |
| invid.c | ⊢ (𝜑 → 𝐶 ∈ Cat) |
| invid.x | ⊢ (𝜑 → 𝑋 ∈ 𝐵) |
| Ref | Expression |
|---|---|
| invid | ⊢ (𝜑 → (𝐼‘𝑋)(𝑋(Inv‘𝐶)𝑋)(𝐼‘𝑋)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | invid.b | . . 3 ⊢ 𝐵 = (Base‘𝐶) | |
| 2 | invid.i | . . 3 ⊢ 𝐼 = (Id‘𝐶) | |
| 3 | invid.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
| 4 | invid.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
| 5 | 1, 2, 3, 4 | sectid 17839 | . 2 ⊢ (𝜑 → (𝐼‘𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼‘𝑋)) |
| 6 | eqid 2769 | . . 3 ⊢ (Inv‘𝐶) = (Inv‘𝐶) | |
| 7 | eqid 2769 | . . 3 ⊢ (Sect‘𝐶) = (Sect‘𝐶) | |
| 8 | 1, 6, 3, 4, 4, 7 | isinv 17813 | . 2 ⊢ (𝜑 → ((𝐼‘𝑋)(𝑋(Inv‘𝐶)𝑋)(𝐼‘𝑋) ↔ ((𝐼‘𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼‘𝑋) ∧ (𝐼‘𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼‘𝑋)))) |
| 9 | 5, 5, 8 | mpbir2and 725 | 1 ⊢ (𝜑 → (𝐼‘𝑋)(𝑋(Inv‘𝐶)𝑋)(𝐼‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1567 ∈ wcel 2149 class class class wbr 5110 ‘cfv 6533 (class class class)co 7408 Basecbs 17265 Catccat 17716 Idccid 17717 Sectcsect 17797 Invcinv 17798 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-rep 5239 ax-sep 5258 ax-nul 5268 ax-pow 5334 ax-pr 5402 ax-un 7730 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-ral 3086 df-rex 3096 df-rmo 3376 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-1st 7982 df-2nd 7983 df-cat 17720 df-cid 17721 df-sect 17800 df-inv 17801 |
| This theorem is referenced by: idiso 17841 idinv 17842 |
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