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Mirrors > Home > MPE Home > Th. List > idinv | Structured version Visualization version GIF version |
Description: The inverse of the identity is the identity. Example 3.13 of [Adamek] p. 28. (Contributed by AV, 9-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 |
---|---|
idinv | ⊢ (𝜑 → ((𝑋(Inv‘𝐶)𝑋)‘(𝐼‘𝑋)) = (𝐼‘𝑋)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | invid.b | . . 3 ⊢ 𝐵 = (Base‘𝐶) | |
2 | eqid 2725 | . . 3 ⊢ (Inv‘𝐶) = (Inv‘𝐶) | |
3 | invid.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
4 | invid.x | . . 3 ⊢ (𝜑 → 𝑋 ∈ 𝐵) | |
5 | 1, 2, 3, 4, 4 | invfun 17755 | . 2 ⊢ (𝜑 → Fun (𝑋(Inv‘𝐶)𝑋)) |
6 | invid.i | . . 3 ⊢ 𝐼 = (Id‘𝐶) | |
7 | 1, 6, 3, 4 | invid 17778 | . 2 ⊢ (𝜑 → (𝐼‘𝑋)(𝑋(Inv‘𝐶)𝑋)(𝐼‘𝑋)) |
8 | funbrfv 6947 | . 2 ⊢ (Fun (𝑋(Inv‘𝐶)𝑋) → ((𝐼‘𝑋)(𝑋(Inv‘𝐶)𝑋)(𝐼‘𝑋) → ((𝑋(Inv‘𝐶)𝑋)‘(𝐼‘𝑋)) = (𝐼‘𝑋))) | |
9 | 5, 7, 8 | sylc 65 | 1 ⊢ (𝜑 → ((𝑋(Inv‘𝐶)𝑋)‘(𝐼‘𝑋)) = (𝐼‘𝑋)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1533 ∈ wcel 2098 class class class wbr 5149 Fun wfun 6543 ‘cfv 6549 (class class class)co 7419 Basecbs 17188 Catccat 17652 Idccid 17653 Invcinv 17736 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2696 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5365 ax-pr 5429 ax-un 7741 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2703 df-cleq 2717 df-clel 2802 df-nfc 2877 df-ne 2930 df-ral 3051 df-rex 3060 df-rmo 3363 df-reu 3364 df-rab 3419 df-v 3463 df-sbc 3774 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-nul 4323 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4910 df-iun 4999 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5576 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-iota 6501 df-fun 6551 df-fn 6552 df-f 6553 df-f1 6554 df-fo 6555 df-f1o 6556 df-fv 6557 df-riota 7375 df-ov 7422 df-oprab 7423 df-mpo 7424 df-1st 7994 df-2nd 7995 df-cat 17656 df-cid 17657 df-sect 17738 df-inv 17739 |
This theorem is referenced by: invisoinvl 17781 |
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