Theorem fununi 6607

Description: The union of a chain (with respect to inclusion) of functions is a function. (Contributed by NM, 10-Aug-2004.)

Assertion

Ref	Expression
fununi	⊢ (∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → Fun ∪ 𝐴)

Distinct variable group:   𝑓,𝑔,𝐴

Proof of Theorem fununi

Dummy variables 𝑥 𝑦 𝑧 𝑣 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		funrel 6548	. . . . 5 ⊢ (Fun 𝑓 → Rel 𝑓)
2	1	adantr 486	. . . 4 ⊢ ((Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → Rel 𝑓)
3	2	ralimi 3100	. . 3 ⊢ (∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ∀𝑓 ∈ 𝐴 Rel 𝑓)
4		reluni 5796	. . 3 ⊢ (Rel ∪ 𝐴 ↔ ∀𝑓 ∈ 𝐴 Rel 𝑓)
5	3, 4	sylibr 237	. 2 ⊢ (∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → Rel ∪ 𝐴)
6		r19.28v 3194	. . . 4 ⊢ ((Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)))
7	6	ralimi 3100	. . 3 ⊢ (∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)))
8		ssel 3925	. . . . . . . . . . . 12 ⊢ (𝑤 ⊆ 𝑣 → (⟨𝑥, 𝑦⟩ ∈ 𝑤 → ⟨𝑥, 𝑦⟩ ∈ 𝑣))
9	8	anim1d 623	. . . . . . . . . . 11 ⊢ (𝑤 ⊆ 𝑣 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → (⟨𝑥, 𝑦⟩ ∈ 𝑣 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)))
10		dffun4 6544	. . . . . . . . . . . . . 14 ⊢ (Fun 𝑣 ↔ (Rel 𝑣 ∧ ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ 𝑣 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
11	10	simprbi 503	. . . . . . . . . . . . 13 ⊢ (Fun 𝑣 → ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ 𝑣 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
12	11	19.21bbi 2227	. . . . . . . . . . . 12 ⊢ (Fun 𝑣 → ∀𝑧((⟨𝑥, 𝑦⟩ ∈ 𝑣 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
13	12	19.21bi 2226	. . . . . . . . . . 11 ⊢ (Fun 𝑣 → ((⟨𝑥, 𝑦⟩ ∈ 𝑣 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
14	9, 13	syl9r 79	. . . . . . . . . 10 ⊢ (Fun 𝑣 → (𝑤 ⊆ 𝑣 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
15	14	adantl 487	. . . . . . . . 9 ⊢ ((Fun 𝑤 ∧ Fun 𝑣) → (𝑤 ⊆ 𝑣 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
16		ssel 3925	. . . . . . . . . . . 12 ⊢ (𝑣 ⊆ 𝑤 → (⟨𝑥, 𝑧⟩ ∈ 𝑣 → ⟨𝑥, 𝑧⟩ ∈ 𝑤))
17	16	anim2d 624	. . . . . . . . . . 11 ⊢ (𝑣 ⊆ 𝑤 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑤)))
18		dffun4 6544	. . . . . . . . . . . . . 14 ⊢ (Fun 𝑤 ↔ (Rel 𝑤 ∧ ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑤) → 𝑦 = 𝑧)))
19	18	simprbi 503	. . . . . . . . . . . . 13 ⊢ (Fun 𝑤 → ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑤) → 𝑦 = 𝑧))
20	19	19.21bbi 2227	. . . . . . . . . . . 12 ⊢ (Fun 𝑤 → ∀𝑧((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑤) → 𝑦 = 𝑧))
21	20	19.21bi 2226	. . . . . . . . . . 11 ⊢ (Fun 𝑤 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑤) → 𝑦 = 𝑧))
22	17, 21	syl9r 79	. . . . . . . . . 10 ⊢ (Fun 𝑤 → (𝑣 ⊆ 𝑤 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
23	22	adantr 486	. . . . . . . . 9 ⊢ ((Fun 𝑤 ∧ Fun 𝑣) → (𝑣 ⊆ 𝑤 → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
24	15, 23	jaod 873	. . . . . . . 8 ⊢ ((Fun 𝑤 ∧ Fun 𝑣) → ((𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤) → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
25	24	imp 412	. . . . . . 7 ⊢ (((Fun 𝑤 ∧ Fun 𝑣) ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
26	25	2ralimi 3133	. . . . . 6 ⊢ (∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((Fun 𝑤 ∧ Fun 𝑣) ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) → ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
27		funeq 6551	. . . . . . . . . 10 ⊢ (𝑓 = 𝑤 → (Fun 𝑓 ↔ Fun 𝑤))
28		sseq1 3956	. . . . . . . . . . 11 ⊢ (𝑓 = 𝑤 → (𝑓 ⊆ 𝑔 ↔ 𝑤 ⊆ 𝑔))
29		sseq2 3957	. . . . . . . . . . 11 ⊢ (𝑓 = 𝑤 → (𝑔 ⊆ 𝑓 ↔ 𝑔 ⊆ 𝑤))
30	28, 29	orbi12d 932	. . . . . . . . . 10 ⊢ (𝑓 = 𝑤 → ((𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓) ↔ (𝑤 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑤)))
31	27, 30	anbi12d 644	. . . . . . . . 9 ⊢ (𝑓 = 𝑤 → ((Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ (Fun 𝑤 ∧ (𝑤 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑤))))
32		sseq2 3957	. . . . . . . . . . 11 ⊢ (𝑔 = 𝑣 → (𝑤 ⊆ 𝑔 ↔ 𝑤 ⊆ 𝑣))
33		sseq1 3956	. . . . . . . . . . 11 ⊢ (𝑔 = 𝑣 → (𝑔 ⊆ 𝑤 ↔ 𝑣 ⊆ 𝑤))
34	32, 33	orbi12d 932	. . . . . . . . . 10 ⊢ (𝑔 = 𝑣 → ((𝑤 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑤) ↔ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
35	34	anbi2d 642	. . . . . . . . 9 ⊢ (𝑔 = 𝑣 → ((Fun 𝑤 ∧ (𝑤 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑤)) ↔ (Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))))
36	31, 35	cbvral2vw 3245	. . . . . . . 8 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
37		ralcom 3291	. . . . . . . . 9 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ ∀𝑔 ∈ 𝐴 ∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)))
38		orcom 884	. . . . . . . . . . . 12 ⊢ ((𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓) ↔ (𝑔 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑔))
39		sseq1 3956	. . . . . . . . . . . . 13 ⊢ (𝑔 = 𝑤 → (𝑔 ⊆ 𝑓 ↔ 𝑤 ⊆ 𝑓))
40		sseq2 3957	. . . . . . . . . . . . 13 ⊢ (𝑔 = 𝑤 → (𝑓 ⊆ 𝑔 ↔ 𝑓 ⊆ 𝑤))
41	39, 40	orbi12d 932	. . . . . . . . . . . 12 ⊢ (𝑔 = 𝑤 → ((𝑔 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑔) ↔ (𝑤 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑤)))
42	38, 41	bitrid 286	. . . . . . . . . . 11 ⊢ (𝑔 = 𝑤 → ((𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓) ↔ (𝑤 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑤)))
43	42	anbi2d 642	. . . . . . . . . 10 ⊢ (𝑔 = 𝑤 → ((Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ (Fun 𝑓 ∧ (𝑤 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑤))))
44		funeq 6551	. . . . . . . . . . 11 ⊢ (𝑓 = 𝑣 → (Fun 𝑓 ↔ Fun 𝑣))
45		sseq2 3957	. . . . . . . . . . . 12 ⊢ (𝑓 = 𝑣 → (𝑤 ⊆ 𝑓 ↔ 𝑤 ⊆ 𝑣))
46		sseq1 3956	. . . . . . . . . . . 12 ⊢ (𝑓 = 𝑣 → (𝑓 ⊆ 𝑤 ↔ 𝑣 ⊆ 𝑤))
47	45, 46	orbi12d 932	. . . . . . . . . . 11 ⊢ (𝑓 = 𝑣 → ((𝑤 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑤) ↔ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
48	44, 47	anbi12d 644	. . . . . . . . . 10 ⊢ (𝑓 = 𝑣 → ((Fun 𝑓 ∧ (𝑤 ⊆ 𝑓 ∨ 𝑓 ⊆ 𝑤)) ↔ (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))))
49	43, 48	cbvral2vw 3245	. . . . . . . . 9 ⊢ (∀𝑔 ∈ 𝐴 ∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
50	37, 49	bitri 278	. . . . . . . 8 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
51	36, 50	anbi12i 640	. . . . . . 7 ⊢ ((∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ∧ ∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓))) ↔ (∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ∧ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))))
52		anidm 575	. . . . . . 7 ⊢ ((∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ∧ ∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓))) ↔ ∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)))
53		anandir 690	. . . . . . . . 9 ⊢ (((Fun 𝑤 ∧ Fun 𝑣) ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ↔ ((Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ∧ (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))))
54	53	2ralbii 3138	. . . . . . . 8 ⊢ (∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((Fun 𝑤 ∧ Fun 𝑣) ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ∧ (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))))
55		r19.26-2 3148	. . . . . . . 8 ⊢ (∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ∧ (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))) ↔ (∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ∧ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))))
56	54, 55	bitr2i 279	. . . . . . 7 ⊢ ((∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑤 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)) ∧ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 (Fun 𝑣 ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤))) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((Fun 𝑤 ∧ Fun 𝑣) ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
57	51, 52, 56	3bitr3i 304	. . . . . 6 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((Fun 𝑤 ∧ Fun 𝑣) ∧ (𝑤 ⊆ 𝑣 ∨ 𝑣 ⊆ 𝑤)))
58		eluni 4870	. . . . . . . . . 10 ⊢ (⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ↔ ∃𝑤(⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴))
59		eluni 4870	. . . . . . . . . 10 ⊢ (⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴 ↔ ∃𝑣(⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴))
60	58, 59	anbi12i 640	. . . . . . . . 9 ⊢ ((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) ↔ (∃𝑤(⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴) ∧ ∃𝑣(⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴)))
61		exdistrv 1988	. . . . . . . . 9 ⊢ (∃𝑤∃𝑣((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴) ∧ (⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴)) ↔ (∃𝑤(⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴) ∧ ∃𝑣(⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴)))
62		an4 669	. . . . . . . . . . 11 ⊢ (((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴) ∧ (⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴)) ↔ ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) ∧ (𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴)))
63	62	biancomi 468	. . . . . . . . . 10 ⊢ (((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴) ∧ (⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴)) ↔ ((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)))
64	63	2exbii 1882	. . . . . . . . 9 ⊢ (∃𝑤∃𝑣((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ 𝑤 ∈ 𝐴) ∧ (⟨𝑥, 𝑧⟩ ∈ 𝑣 ∧ 𝑣 ∈ 𝐴)) ↔ ∃𝑤∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)))
65	60, 61, 64	3bitr2i 302	. . . . . . . 8 ⊢ ((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) ↔ ∃𝑤∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)))
66	65	imbi1i 352	. . . . . . 7 ⊢ (((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧) ↔ (∃𝑤∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧))
67		19.23v 1975	. . . . . . 7 ⊢ (∀𝑤(∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧) ↔ (∃𝑤∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧))
68		r2al 3199	. . . . . . . 8 ⊢ (∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧) ↔ ∀𝑤∀𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
69		impexp 456	. . . . . . . . 9 ⊢ ((((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧) ↔ ((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
70	69	2albii 1853	. . . . . . . 8 ⊢ (∀𝑤∀𝑣(((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧) ↔ ∀𝑤∀𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) → ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧)))
71		19.23v 1975	. . . . . . . . 9 ⊢ (∀𝑣(((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧) ↔ (∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧))
72	71	albii 1852	. . . . . . . 8 ⊢ (∀𝑤∀𝑣(((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧) ↔ ∀𝑤(∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧))
73	68, 70, 72	3bitr2ri 303	. . . . . . 7 ⊢ (∀𝑤(∃𝑣((𝑤 ∈ 𝐴 ∧ 𝑣 ∈ 𝐴) ∧ (⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣)) → 𝑦 = 𝑧) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
74	66, 67, 73	3bitr2i 302	. . . . . 6 ⊢ (((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧) ↔ ∀𝑤 ∈ 𝐴 ∀𝑣 ∈ 𝐴 ((⟨𝑥, 𝑦⟩ ∈ 𝑤 ∧ ⟨𝑥, 𝑧⟩ ∈ 𝑣) → 𝑦 = 𝑧))
75	26, 57, 74	3imtr4i 295	. . . . 5 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧))
76	75	alrimiv 1960	. . . 4 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ∀𝑧((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧))
77	76	alrimivv 1961	. . 3 ⊢ (∀𝑓 ∈ 𝐴 ∀𝑔 ∈ 𝐴 (Fun 𝑓 ∧ (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧))
78	7, 77	syl 18	. 2 ⊢ (∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧))
79		dffun4 6544	. 2 ⊢ (Fun ∪ 𝐴 ↔ (Rel ∪ 𝐴 ∧ ∀𝑥∀𝑦∀𝑧((⟨𝑥, 𝑦⟩ ∈ ∪ 𝐴 ∧ ⟨𝑥, 𝑧⟩ ∈ ∪ 𝐴) → 𝑦 = 𝑧)))
80	5, 78, 79	sylanbrc 595	1 ⊢ (∀𝑓 ∈ 𝐴 (Fun 𝑓 ∧ ∀𝑔 ∈ 𝐴 (𝑓 ⊆ 𝑔 ∨ 𝑔 ⊆ 𝑓)) → Fun ∪ 𝐴)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∨ wo 861  ∀wal 1568  ∃wex 1812   ∈ wcel 2145  ∀wral 3077   ⊆ wss 3899  ⟨cop 4590  ∪ cuni 4867  Rel wrel 5656  Fun wfun 6525

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-pr 5391

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-fun 6533

This theorem is used by:  funcnvuni  7933  fun11uni  7934  fiun  7944  axdc3lem2  10510