Theorem estrccatid 18069

Description: Lemma for estrccat 18070. (Contributed by AV, 8-Mar-2020.)

Hypothesis

Ref	Expression
estrccat.c	⊢ 𝐶 = (ExtStrCat‘𝑈)

Assertion

Ref	Expression
estrccatid	⊢ (𝑈 ∈ 𝑉 → (𝐶 ∈ Cat ∧ (Id‘𝐶) = (𝑥 ∈ 𝑈 ↦ ( I ↾ (Base‘𝑥)))))

Distinct variable groups:   𝑥,𝐶   𝑥,𝑈   𝑥,𝑉

Proof of Theorem estrccatid

Dummy variables 𝑓 𝑔 ℎ 𝑤 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		estrccat.c	. . 3 ⊢ 𝐶 = (ExtStrCat‘𝑈)
2		id 22	. . 3 ⊢ (𝑈 ∈ 𝑉 → 𝑈 ∈ 𝑉)
3	1, 2	estrcbas 18062	. 2 ⊢ (𝑈 ∈ 𝑉 → 𝑈 = (Base‘𝐶))
4		eqidd 2738	. 2 ⊢ (𝑈 ∈ 𝑉 → (Hom ‘𝐶) = (Hom ‘𝐶))
5		eqidd 2738	. 2 ⊢ (𝑈 ∈ 𝑉 → (comp‘𝐶) = (comp‘𝐶))
6	1	fvexi 6858	. . 3 ⊢ 𝐶 ∈ V
7	6	a1i 11	. 2 ⊢ (𝑈 ∈ 𝑉 → 𝐶 ∈ V)
8		biid 261	. 2 ⊢ (((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧))) ↔ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧))))
9		f1oi 6822	. . . 4 ⊢ ( I ↾ (Base‘𝑥)):(Base‘𝑥)–1-1-onto→(Base‘𝑥)
10		f1of 6784	. . . 4 ⊢ (( I ↾ (Base‘𝑥)):(Base‘𝑥)–1-1-onto→(Base‘𝑥) → ( I ↾ (Base‘𝑥)):(Base‘𝑥)⟶(Base‘𝑥))
11	9, 10	mp1i 13	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑥 ∈ 𝑈) → ( I ↾ (Base‘𝑥)):(Base‘𝑥)⟶(Base‘𝑥))
12		simpl 482	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑥 ∈ 𝑈) → 𝑈 ∈ 𝑉)
13		eqid 2737	. . . 4 ⊢ (Hom ‘𝐶) = (Hom ‘𝐶)
14		simpr 484	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑥 ∈ 𝑈) → 𝑥 ∈ 𝑈)
15		eqid 2737	. . . 4 ⊢ (Base‘𝑥) = (Base‘𝑥)
16	1, 12, 13, 14, 14, 15, 15	elestrchom 18065	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑥 ∈ 𝑈) → (( I ↾ (Base‘𝑥)) ∈ (𝑥(Hom ‘𝐶)𝑥) ↔ ( I ↾ (Base‘𝑥)):(Base‘𝑥)⟶(Base‘𝑥)))
17	11, 16	mpbird 257	. 2 ⊢ ((𝑈 ∈ 𝑉 ∧ 𝑥 ∈ 𝑈) → ( I ↾ (Base‘𝑥)) ∈ (𝑥(Hom ‘𝐶)𝑥))
18		simpl 482	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑈 ∈ 𝑉)
19		eqid 2737	. . . 4 ⊢ (comp‘𝐶) = (comp‘𝐶)
20		simpr1l 1232	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑤 ∈ 𝑈)
21		simpr1r 1233	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑥 ∈ 𝑈)
22		eqid 2737	. . . 4 ⊢ (Base‘𝑤) = (Base‘𝑤)
23		simpr31 1265	. . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥))
24	1, 18, 13, 20, 21, 22, 15	elestrchom 18065	. . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ↔ 𝑓:(Base‘𝑤)⟶(Base‘𝑥)))
25	23, 24	mpbid 232	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑓:(Base‘𝑤)⟶(Base‘𝑥))
26	9, 10	mp1i 13	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ( I ↾ (Base‘𝑥)):(Base‘𝑥)⟶(Base‘𝑥))
27	1, 18, 19, 20, 21, 21, 22, 15, 15, 25, 26	estrcco 18067	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (( I ↾ (Base‘𝑥))(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑥)𝑓) = (( I ↾ (Base‘𝑥)) ∘ 𝑓))
28		fcoi2 6719	. . . 4 ⊢ (𝑓:(Base‘𝑤)⟶(Base‘𝑥) → (( I ↾ (Base‘𝑥)) ∘ 𝑓) = 𝑓)
29	25, 28	syl 17	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (( I ↾ (Base‘𝑥)) ∘ 𝑓) = 𝑓)
30	27, 29	eqtrd 2772	. 2 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (( I ↾ (Base‘𝑥))(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑥)𝑓) = 𝑓)
31		simpr2l 1234	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑦 ∈ 𝑈)
32		eqid 2737	. . . 4 ⊢ (Base‘𝑦) = (Base‘𝑦)
33		simpr32 1266	. . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦))
34	1, 18, 13, 21, 31, 15, 32	elestrchom 18065	. . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ↔ 𝑔:(Base‘𝑥)⟶(Base‘𝑦)))
35	33, 34	mpbid 232	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑔:(Base‘𝑥)⟶(Base‘𝑦))
36	1, 18, 19, 21, 21, 31, 15, 15, 32, 26, 35	estrcco 18067	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔(⟨𝑥, 𝑥⟩(comp‘𝐶)𝑦)( I ↾ (Base‘𝑥))) = (𝑔 ∘ ( I ↾ (Base‘𝑥))))
37		fcoi1 6718	. . . 4 ⊢ (𝑔:(Base‘𝑥)⟶(Base‘𝑦) → (𝑔 ∘ ( I ↾ (Base‘𝑥))) = 𝑔)
38	35, 37	syl 17	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔 ∘ ( I ↾ (Base‘𝑥))) = 𝑔)
39	36, 38	eqtrd 2772	. 2 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔(⟨𝑥, 𝑥⟩(comp‘𝐶)𝑦)( I ↾ (Base‘𝑥))) = 𝑔)
40	1, 18, 19, 20, 21, 31, 22, 15, 32, 25, 35	estrcco 18067	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑦)𝑓) = (𝑔 ∘ 𝑓))
41		fco 6696	. . . . 5 ⊢ ((𝑔:(Base‘𝑥)⟶(Base‘𝑦) ∧ 𝑓:(Base‘𝑤)⟶(Base‘𝑥)) → (𝑔 ∘ 𝑓):(Base‘𝑤)⟶(Base‘𝑦))
42	35, 25, 41	syl2anc 585	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔 ∘ 𝑓):(Base‘𝑤)⟶(Base‘𝑦))
43	1, 18, 13, 20, 31, 22, 32	elestrchom 18065	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ((𝑔 ∘ 𝑓) ∈ (𝑤(Hom ‘𝐶)𝑦) ↔ (𝑔 ∘ 𝑓):(Base‘𝑤)⟶(Base‘𝑦)))
44	42, 43	mpbird 257	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔 ∘ 𝑓) ∈ (𝑤(Hom ‘𝐶)𝑦))
45	40, 44	eqeltrd 2837	. 2 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (𝑔(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑦)𝑓) ∈ (𝑤(Hom ‘𝐶)𝑦))
46		coass 6234	. . . 4 ⊢ ((ℎ ∘ 𝑔) ∘ 𝑓) = (ℎ ∘ (𝑔 ∘ 𝑓))
47		simpr2r 1235	. . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → 𝑧 ∈ 𝑈)
48		eqid 2737	. . . . 5 ⊢ (Base‘𝑧) = (Base‘𝑧)
49		simpr33 1267	. . . . . . 7 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ℎ ∈ (𝑦(Hom ‘𝐶)𝑧))
50	1, 18, 13, 31, 47, 32, 48	elestrchom 18065	. . . . . . 7 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (ℎ ∈ (𝑦(Hom ‘𝐶)𝑧) ↔ ℎ:(Base‘𝑦)⟶(Base‘𝑧)))
51	49, 50	mpbid 232	. . . . . 6 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ℎ:(Base‘𝑦)⟶(Base‘𝑧))
52		fco 6696	. . . . . 6 ⊢ ((ℎ:(Base‘𝑦)⟶(Base‘𝑧) ∧ 𝑔:(Base‘𝑥)⟶(Base‘𝑦)) → (ℎ ∘ 𝑔):(Base‘𝑥)⟶(Base‘𝑧))
53	51, 35, 52	syl2anc 585	. . . . 5 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (ℎ ∘ 𝑔):(Base‘𝑥)⟶(Base‘𝑧))
54	1, 18, 19, 20, 21, 47, 22, 15, 48, 25, 53	estrcco 18067	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ((ℎ ∘ 𝑔)(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑧)𝑓) = ((ℎ ∘ 𝑔) ∘ 𝑓))
55	1, 18, 19, 20, 31, 47, 22, 32, 48, 42, 51	estrcco 18067	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (ℎ(⟨𝑤, 𝑦⟩(comp‘𝐶)𝑧)(𝑔 ∘ 𝑓)) = (ℎ ∘ (𝑔 ∘ 𝑓)))
56	46, 54, 55	3eqtr4a 2798	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ((ℎ ∘ 𝑔)(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑧)𝑓) = (ℎ(⟨𝑤, 𝑦⟩(comp‘𝐶)𝑧)(𝑔 ∘ 𝑓)))
57	1, 18, 19, 21, 31, 47, 15, 32, 48, 35, 51	estrcco 18067	. . . 4 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (ℎ(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑔) = (ℎ ∘ 𝑔))
58	57	oveq1d 7385	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ((ℎ(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑔)(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑧)𝑓) = ((ℎ ∘ 𝑔)(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑧)𝑓))
59	40	oveq2d 7386	. . 3 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → (ℎ(⟨𝑤, 𝑦⟩(comp‘𝐶)𝑧)(𝑔(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑦)𝑓)) = (ℎ(⟨𝑤, 𝑦⟩(comp‘𝐶)𝑧)(𝑔 ∘ 𝑓)))
60	56, 58, 59	3eqtr4d 2782	. 2 ⊢ ((𝑈 ∈ 𝑉 ∧ ((𝑤 ∈ 𝑈 ∧ 𝑥 ∈ 𝑈) ∧ (𝑦 ∈ 𝑈 ∧ 𝑧 ∈ 𝑈) ∧ (𝑓 ∈ (𝑤(Hom ‘𝐶)𝑥) ∧ 𝑔 ∈ (𝑥(Hom ‘𝐶)𝑦) ∧ ℎ ∈ (𝑦(Hom ‘𝐶)𝑧)))) → ((ℎ(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑔)(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑧)𝑓) = (ℎ(⟨𝑤, 𝑦⟩(comp‘𝐶)𝑧)(𝑔(⟨𝑤, 𝑥⟩(comp‘𝐶)𝑦)𝑓)))
61	3, 4, 5, 7, 8, 17, 30, 39, 45, 60	iscatd2 17618	1 ⊢ (𝑈 ∈ 𝑉 → (𝐶 ∈ Cat ∧ (Id‘𝐶) = (𝑥 ∈ 𝑈 ↦ ( I ↾ (Base‘𝑥)))))

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1087   = wceq 1542   ∈ wcel 2114  Vcvv 3442  ⟨cop 4588   ↦ cmpt 5181   I cid 5528   ↾ cres 5636   ∘ ccom 5638  ⟶wf 6498  –1-1-onto→wf1o 6501  ‘cfv 6502  (class class class)co 7370  Basecbs 17150  Hom chom 17202  compcco 17203  Catccat 17601  Idccid 17602  ExtStrCatcestrc 18059

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5226  ax-sep 5245  ax-nul 5255  ax-pow 5314  ax-pr 5381  ax-un 7692  ax-cnex 11096  ax-resscn 11097  ax-1cn 11098  ax-icn 11099  ax-addcl 11100  ax-addrcl 11101  ax-mulcl 11102  ax-mulrcl 11103  ax-mulcom 11104  ax-addass 11105  ax-mulass 11106  ax-distr 11107  ax-i2m1 11108  ax-1ne0 11109  ax-1rid 11110  ax-rnegex 11111  ax-rrecex 11112  ax-cnre 11113  ax-pre-lttri 11114  ax-pre-lttrn 11115  ax-pre-ltadd 11116  ax-pre-mulgt0 11117

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3or 1088  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-nel 3038  df-ral 3053  df-rex 3063  df-rmo 3352  df-reu 3353  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-tp 4587  df-op 4589  df-uni 4866  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-tr 5208  df-id 5529  df-eprel 5534  df-po 5542  df-so 5543  df-fr 5587  df-we 5589  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-res 5646  df-ima 5647  df-pred 6269  df-ord 6330  df-on 6331  df-lim 6332  df-suc 6333  df-iota 6458  df-fun 6504  df-fn 6505  df-f 6506  df-f1 6507  df-fo 6508  df-f1o 6509  df-fv 6510  df-riota 7327  df-ov 7373  df-oprab 7374  df-mpo 7375  df-om 7821  df-1st 7945  df-2nd 7946  df-frecs 8235  df-wrecs 8266  df-recs 8315  df-rdg 8353  df-1o 8409  df-er 8647  df-map 8779  df-en 8898  df-dom 8899  df-sdom 8900  df-fin 8901  df-pnf 11182  df-mnf 11183  df-xr 11184  df-ltxr 11185  df-le 11186  df-sub 11380  df-neg 11381  df-nn 12160  df-2 12222  df-3 12223  df-4 12224  df-5 12225  df-6 12226  df-7 12227  df-8 12228  df-9 12229  df-n0 12416  df-z 12503  df-dec 12622  df-uz 12766  df-fz 13438  df-struct 17088  df-slot 17123  df-ndx 17135  df-base 17151  df-hom 17215  df-cco 17216  df-cat 17605  df-cid 17606  df-estrc 18060

This theorem is referenced by:  estrccat  18070  estrcid  18071