Theorem idaf 16914

Description: The identity arrow function is a function from objects to arrows. (Contributed by Mario Carneiro, 11-Jan-2017.)

Hypotheses

Ref	Expression
idafval.i	⊢ 𝐼 = (Ida‘𝐶)
idafval.b	⊢ 𝐵 = (Base‘𝐶)
idafval.c	⊢ (𝜑 → 𝐶 ∈ Cat)
idaf.a	⊢ 𝐴 = (Arrow‘𝐶)

Assertion

Ref	Expression
idaf	⊢ (𝜑 → 𝐼:𝐵⟶𝐴)

Proof of Theorem idaf

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		otex 5082	. . 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 2760	. . 3 ⊢ (Id‘𝐶) = (Id‘𝐶)
7	3, 4, 5, 6	idafval 16908	. 2 ⊢ (𝜑 → 𝐼 = (𝑥 ∈ 𝐵 ↦ ⟨𝑥, 𝑥, ((Id‘𝐶)‘𝑥)⟩))
8		idaf.a	. . . 4 ⊢ 𝐴 = (Arrow‘𝐶)
9		eqid 2760	. . . 4 ⊢ (Homa‘𝐶) = (Homa‘𝐶)
10	8, 9	homarw 16897	. . 3 ⊢ (𝑥(Homa‘𝐶)𝑥) ⊆ 𝐴
11	5	adantr 472	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐶 ∈ Cat)
12		simpr 479	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
13	3, 4, 11, 12, 9	idahom 16911	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝐼‘𝑥) ∈ (𝑥(Homa‘𝐶)𝑥))
14	10, 13	sseldi 3742	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝐼‘𝑥) ∈ 𝐴)
15	2, 7, 14	fmpt2d 6556	1 ⊢ (𝜑 → 𝐼:𝐵⟶𝐴)

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1632   ∈ wcel 2139  Vcvv 3340  ⟨cotp 4329  ⟶wf 6045  ‘cfv 6049  (class class class)co 6813  Basecbs 16059  Catccat 16526  Idccid 16527  Arrowcarw 16873  Hom_achoma 16874  Id_acida 16904

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-rep 4923  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7114

This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-reu 3057  df-rmo 3058  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-op 4328  df-ot 4330  df-uni 4589  df-iun 4674  df-br 4805  df-opab 4865  df-mpt 4882  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-riota 6774  df-ov 6816  df-cat 16530  df-cid 16531  df-homa 16877  df-arw 16878  df-ida 16906

This theorem is referenced by: (None)