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| Mirrors > Home > MPE Home > Th. List > idaf | Structured version Visualization version GIF version | ||
| Description: The identity arrow function is a function from objects to arrows. (Contributed by Mario Carneiro, 11-Jan-2017.) |
| Ref | Expression |
|---|---|
| idafval.i | ⊢ 𝐼 = (Ida‘𝐶) |
| idafval.b | ⊢ 𝐵 = (Base‘𝐶) |
| idafval.c | ⊢ (𝜑 → 𝐶 ∈ Cat) |
| idaf.a | ⊢ 𝐴 = (Arrow‘𝐶) |
| Ref | Expression |
|---|---|
| idaf | ⊢ (𝜑 → 𝐼:𝐵⟶𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | otex 5448 | . . 3 ⊢ 〈𝑥, 𝑥, ((Id‘𝐶)‘𝑥)〉 ∈ V | |
| 2 | 1 | a1i 11 | . 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 〈𝑥, 𝑥, ((Id‘𝐶)‘𝑥)〉 ∈ V) |
| 3 | idafval.i | . . 3 ⊢ 𝐼 = (Ida‘𝐶) | |
| 4 | idafval.b | . . 3 ⊢ 𝐵 = (Base‘𝐶) | |
| 5 | idafval.c | . . 3 ⊢ (𝜑 → 𝐶 ∈ Cat) | |
| 6 | eqid 2769 | . . 3 ⊢ (Id‘𝐶) = (Id‘𝐶) | |
| 7 | 3, 4, 5, 6 | idafval 18114 | . 2 ⊢ (𝜑 → 𝐼 = (𝑥 ∈ 𝐵 ↦ 〈𝑥, 𝑥, ((Id‘𝐶)‘𝑥)〉)) |
| 8 | idaf.a | . . . 4 ⊢ 𝐴 = (Arrow‘𝐶) | |
| 9 | eqid 2769 | . . . 4 ⊢ (Homa‘𝐶) = (Homa‘𝐶) | |
| 10 | 8, 9 | homarw 18103 | . . 3 ⊢ (𝑥(Homa‘𝐶)𝑥) ⊆ 𝐴 |
| 11 | 5 | adantr 485 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐶 ∈ Cat) |
| 12 | simpr 489 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵) | |
| 13 | 3, 4, 11, 12, 9 | idahom 18117 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝐼‘𝑥) ∈ (𝑥(Homa‘𝐶)𝑥)) |
| 14 | 10, 13 | sselid 3943 | . 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝐼‘𝑥) ∈ 𝐴) |
| 15 | 2, 7, 14 | fmpt2d 7121 | 1 ⊢ (𝜑 → 𝐼:𝐵⟶𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 = wceq 1567 ∈ wcel 2149 Vcvv 3463 〈cotp 4602 ⟶wf 6533 ‘cfv 6537 (class class class)co 7411 Basecbs 17269 Catccat 17720 Idccid 17721 Arrowcarw 18079 Homachoma 18080 Idacida 18110 |
| 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 5242 ax-sep 5261 ax-nul 5271 ax-pow 5337 ax-pr 5405 ax-un 7733 |
| 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 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-ot 4603 df-uni 4877 df-iun 4962 df-br 5114 df-opab 5178 df-mpt 5197 df-id 5557 df-xp 5668 df-rel 5669 df-cnv 5670 df-co 5671 df-dm 5672 df-rn 5673 df-res 5674 df-ima 5675 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7368 df-ov 7414 df-cat 17724 df-cid 17725 df-homa 18083 df-arw 18084 df-ida 18112 |
| This theorem is referenced by: (None) |
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