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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 17744 | . 2 ⊢ (𝜑 → (𝐼‘𝑋)(𝑋(Sect‘𝐶)𝑋)(𝐼‘𝑋)) |
| 6 | eqid 2739 | . . 3 ⊢ (Inv‘𝐶) = (Inv‘𝐶) | |
| 7 | eqid 2739 | . . 3 ⊢ (Sect‘𝐶) = (Sect‘𝐶) | |
| 8 | 1, 6, 3, 4, 4, 7 | isinv 17718 | . 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 719 | 1 ⊢ (𝜑 → (𝐼‘𝑋)(𝑋(Inv‘𝐶)𝑋)(𝐼‘𝑋)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1547 ∈ wcel 2119 class class class wbr 5072 ‘cfv 6485 (class class class)co 7356 Basecbs 17170 Catccat 17621 Idccid 17622 Sectcsect 17702 Invcinv 17703 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-rep 5199 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-iun 4923 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-1st 7931 df-2nd 7932 df-cat 17625 df-cid 17626 df-sect 17705 df-inv 17706 |
| This theorem is referenced by: idiso 17746 idinv 17747 |
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