Theorem isomuspgrlem2d 46960

Description: Lemma 4 for isomuspgrlem2 46962. (Contributed by AV, 1-Dec-2022.)

Hypotheses

Ref	Expression
isomushgr.v	⊢ 𝑉 = (Vtx‘𝐴)
isomushgr.w	⊢ 𝑊 = (Vtx‘𝐵)
isomushgr.e	⊢ 𝐸 = (Edg‘𝐴)
isomushgr.k	⊢ 𝐾 = (Edg‘𝐵)
isomuspgrlem2.g	⊢ 𝐺 = (𝑥 ∈ 𝐸 ↦ (𝐹 “ 𝑥))
isomuspgrlem2.a	⊢ (𝜑 → 𝐴 ∈ USPGraph)
isomuspgrlem2.f	⊢ (𝜑 → 𝐹:𝑉–1-1-onto→𝑊)
isomuspgrlem2.i	⊢ (𝜑 → ∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾))
isomuspgrlem2.x	⊢ (𝜑 → 𝐹 ∈ 𝑋)
isomuspgrlem2.b	⊢ (𝜑 → 𝐵 ∈ USPGraph)

Assertion

Ref	Expression
isomuspgrlem2d	⊢ (𝜑 → 𝐺:𝐸–onto→𝐾)

Distinct variable groups:   𝑎,𝑏,𝑥   𝑥,𝐴   𝑥,𝐵   𝑥,𝐸   𝑥,𝐾   𝑥,𝑉   𝑥,𝑊   𝑥,𝐹   𝑥,𝑋   𝐸,𝑎,𝑏   𝐹,𝑎,𝑏   𝐾,𝑎,𝑏   𝑉,𝑎,𝑏   𝜑,𝑥

Allowed substitution hints:   𝜑(𝑎,𝑏)   𝐴(𝑎,𝑏)   𝐵(𝑎,𝑏)   𝐺(𝑥,𝑎,𝑏)   𝑊(𝑎,𝑏)   𝑋(𝑎,𝑏)

Proof of Theorem isomuspgrlem2d

Dummy variables 𝑒 𝑦 𝑐 𝑑 𝑚 𝑛 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		isomushgr.v	. . 3 ⊢ 𝑉 = (Vtx‘𝐴)
2		isomushgr.w	. . 3 ⊢ 𝑊 = (Vtx‘𝐵)
3		isomushgr.e	. . 3 ⊢ 𝐸 = (Edg‘𝐴)
4		isomushgr.k	. . 3 ⊢ 𝐾 = (Edg‘𝐵)
5		isomuspgrlem2.g	. . 3 ⊢ 𝐺 = (𝑥 ∈ 𝐸 ↦ (𝐹 “ 𝑥))
6		isomuspgrlem2.a	. . 3 ⊢ (𝜑 → 𝐴 ∈ USPGraph)
7		isomuspgrlem2.f	. . 3 ⊢ (𝜑 → 𝐹:𝑉–1-1-onto→𝑊)
8		isomuspgrlem2.i	. . 3 ⊢ (𝜑 → ∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾))
9	1, 2, 3, 4, 5, 6, 7, 8	isomuspgrlem2b 46958	. 2 ⊢ (𝜑 → 𝐺:𝐸⟶𝐾)
10		isomuspgrlem2.b	. . . . . 6 ⊢ (𝜑 → 𝐵 ∈ USPGraph)
11		uspgrupgr 28870	. . . . . 6 ⊢ (𝐵 ∈ USPGraph → 𝐵 ∈ UPGraph)
12	10, 11	syl 17	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ UPGraph)
13	2, 4	upgredg 28831	. . . . 5 ⊢ ((𝐵 ∈ UPGraph ∧ 𝑦 ∈ 𝐾) → ∃𝑐 ∈ 𝑊 ∃𝑑 ∈ 𝑊 𝑦 = {𝑐, 𝑑})
14	12, 13	sylan 579	. . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐾) → ∃𝑐 ∈ 𝑊 ∃𝑑 ∈ 𝑊 𝑦 = {𝑐, 𝑑})
15		eleq1 2820	. . . . . . . . . . 11 ⊢ (𝑦 = {𝑐, 𝑑} → (𝑦 ∈ 𝐾 ↔ {𝑐, 𝑑} ∈ 𝐾))
16	15	anbi2d 628	. . . . . . . . . 10 ⊢ (𝑦 = {𝑐, 𝑑} → ((𝜑 ∧ 𝑦 ∈ 𝐾) ↔ (𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾)))
17		f1ofo 6840	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐹:𝑉–1-1-onto→𝑊 → 𝐹:𝑉–onto→𝑊)
18	7, 17	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (𝜑 → 𝐹:𝑉–onto→𝑊)
19		foelrn 7108	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐹:𝑉–onto→𝑊 ∧ 𝑐 ∈ 𝑊) → ∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚))
20	18, 19	sylan 579	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑐 ∈ 𝑊) → ∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚))
21	20	ex 412	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑐 ∈ 𝑊 → ∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚)))
22		foelrn 7108	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐹:𝑉–onto→𝑊 ∧ 𝑑 ∈ 𝑊) → ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛))
23	18, 22	sylan 579	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ 𝑑 ∈ 𝑊) → ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛))
24	23	ex 412	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝑑 ∈ 𝑊 → ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛)))
25	21, 24	anim12d 608	. . . . . . . . . . . . . 14 ⊢ (𝜑 → ((𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊) → (∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚) ∧ ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛))))
26	25	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) → ((𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊) → (∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚) ∧ ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛))))
27	26	imp 406	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → (∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚) ∧ ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛)))
28		preq12 4739	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ ((𝑐 = (𝐹‘𝑚) ∧ 𝑑 = (𝐹‘𝑛)) → {𝑐, 𝑑} = {(𝐹‘𝑚), (𝐹‘𝑛)})
29	28	ancoms 458	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → {𝑐, 𝑑} = {(𝐹‘𝑚), (𝐹‘𝑛)})
30	29	eleq1d 2817	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → ({𝑐, 𝑑} ∈ 𝐾 ↔ {(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾))
31		preq1 4737	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ⊢ (𝑎 = 𝑚 → {𝑎, 𝑏} = {𝑚, 𝑏})
32	31	eleq1d 2817	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ⊢ (𝑎 = 𝑚 → ({𝑎, 𝑏} ∈ 𝐸 ↔ {𝑚, 𝑏} ∈ 𝐸))
33		fveq2 6891	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ⊢ (𝑎 = 𝑚 → (𝐹‘𝑎) = (𝐹‘𝑚))
34	33	preq1d 4743	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ⊢ (𝑎 = 𝑚 → {(𝐹‘𝑎), (𝐹‘𝑏)} = {(𝐹‘𝑚), (𝐹‘𝑏)})
35	34	eleq1d 2817	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ⊢ (𝑎 = 𝑚 → ({(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾 ↔ {(𝐹‘𝑚), (𝐹‘𝑏)} ∈ 𝐾))
36	32, 35	bibi12d 345	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ⊢ (𝑎 = 𝑚 → (({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾) ↔ ({𝑚, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑚), (𝐹‘𝑏)} ∈ 𝐾)))
37		preq2 4738	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ⊢ (𝑏 = 𝑛 → {𝑚, 𝑏} = {𝑚, 𝑛})
38	37	eleq1d 2817	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ⊢ (𝑏 = 𝑛 → ({𝑚, 𝑏} ∈ 𝐸 ↔ {𝑚, 𝑛} ∈ 𝐸))
39		fveq2 6891	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ⊢ (𝑏 = 𝑛 → (𝐹‘𝑏) = (𝐹‘𝑛))
40	39	preq2d 4744	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ⊢ (𝑏 = 𝑛 → {(𝐹‘𝑚), (𝐹‘𝑏)} = {(𝐹‘𝑚), (𝐹‘𝑛)})
41	40	eleq1d 2817	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ⊢ (𝑏 = 𝑛 → ({(𝐹‘𝑚), (𝐹‘𝑏)} ∈ 𝐾 ↔ {(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾))
42	38, 41	bibi12d 345	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ⊢ (𝑏 = 𝑛 → (({𝑚, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑚), (𝐹‘𝑏)} ∈ 𝐾) ↔ ({𝑚, 𝑛} ∈ 𝐸 ↔ {(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾)))
43	36, 42	rspc2va 3623	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ (((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) ∧ ∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾)) → ({𝑚, 𝑛} ∈ 𝐸 ↔ {(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾))
44	43	bicomd 222	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) ∧ ∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾)) → ({(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾 ↔ {𝑚, 𝑛} ∈ 𝐸))
45	44	ancoms 458	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ((∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → ({(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾 ↔ {𝑚, 𝑛} ∈ 𝐸))
46	45	biimpd 228	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ ((∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → ({(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾 → {𝑚, 𝑛} ∈ 𝐸))
47	46	ex 412	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (∀𝑎 ∈ 𝑉 ∀𝑏 ∈ 𝑉 ({𝑎, 𝑏} ∈ 𝐸 ↔ {(𝐹‘𝑎), (𝐹‘𝑏)} ∈ 𝐾) → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → ({(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾 → {𝑚, 𝑛} ∈ 𝐸)))
48	8, 47	syl 17	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝜑 → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → ({(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾 → {𝑚, 𝑛} ∈ 𝐸)))
49	48	com13 88	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ({(𝐹‘𝑚), (𝐹‘𝑛)} ∈ 𝐾 → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → (𝜑 → {𝑚, 𝑛} ∈ 𝐸)))
50	30, 49	syl6bi 253	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → ({𝑐, 𝑑} ∈ 𝐾 → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → (𝜑 → {𝑚, 𝑛} ∈ 𝐸))))
51	50	com14 96	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝜑 → ({𝑐, 𝑑} ∈ 𝐾 → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → {𝑚, 𝑛} ∈ 𝐸))))
52	51	imp 406	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → {𝑚, 𝑛} ∈ 𝐸)))
53	52	adantr 480	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → {𝑚, 𝑛} ∈ 𝐸)))
54	53	imp31 417	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) → {𝑚, 𝑛} ∈ 𝐸)
55		imaeq2 6055	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑒 = {𝑚, 𝑛} → (𝐹 “ 𝑒) = (𝐹 “ {𝑚, 𝑛}))
56		f1ofn 6834	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝐹:𝑉–1-1-onto→𝑊 → 𝐹 Fn 𝑉)
57	7, 56	syl 17	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝜑 → 𝐹 Fn 𝑉)
58	57	ad3antrrr 727	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → 𝐹 Fn 𝑉)
59		simprl 768	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → 𝑚 ∈ 𝑉)
60		simpr 484	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → 𝑛 ∈ 𝑉)
61	60	adantl 481	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → 𝑛 ∈ 𝑉)
62	58, 59, 61	3jca 1127	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → (𝐹 Fn 𝑉 ∧ 𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉))
63	62	adantr 480	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) → (𝐹 Fn 𝑉 ∧ 𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉))
64		fnimapr 6975	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝐹 Fn 𝑉 ∧ 𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉) → (𝐹 “ {𝑚, 𝑛}) = {(𝐹‘𝑚), (𝐹‘𝑛)})
65	63, 64	syl 17	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) → (𝐹 “ {𝑚, 𝑛}) = {(𝐹‘𝑚), (𝐹‘𝑛)})
66	55, 65	sylan9eqr 2793	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) ∧ 𝑒 = {𝑚, 𝑛}) → (𝐹 “ 𝑒) = {(𝐹‘𝑚), (𝐹‘𝑛)})
67	66	eqeq2d 2742	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) ∧ 𝑒 = {𝑚, 𝑛}) → ({𝑐, 𝑑} = (𝐹 “ 𝑒) ↔ {𝑐, 𝑑} = {(𝐹‘𝑚), (𝐹‘𝑛)}))
68	29	adantl 481	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) → {𝑐, 𝑑} = {(𝐹‘𝑚), (𝐹‘𝑛)})
69	54, 67, 68	rspcedvd 3614	. . . . . . . . . . . . . . . . . . 19 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) ∧ (𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚))) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))
70	69	ex 412	. . . . . . . . . . . . . . . . . 18 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ (𝑚 ∈ 𝑉 ∧ 𝑛 ∈ 𝑉)) → ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒)))
71	70	anassrs 467	. . . . . . . . . . . . . . . . 17 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑚 ∈ 𝑉) ∧ 𝑛 ∈ 𝑉) → ((𝑑 = (𝐹‘𝑛) ∧ 𝑐 = (𝐹‘𝑚)) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒)))
72	71	expd 415	. . . . . . . . . . . . . . . 16 ⊢ (((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑚 ∈ 𝑉) ∧ 𝑛 ∈ 𝑉) → (𝑑 = (𝐹‘𝑛) → (𝑐 = (𝐹‘𝑚) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))))
73	72	rexlimdva 3154	. . . . . . . . . . . . . . 15 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑚 ∈ 𝑉) → (∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛) → (𝑐 = (𝐹‘𝑚) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))))
74	73	com23 86	. . . . . . . . . . . . . 14 ⊢ ((((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑚 ∈ 𝑉) → (𝑐 = (𝐹‘𝑚) → (∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))))
75	74	rexlimdva 3154	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → (∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚) → (∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))))
76	75	impd 410	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → ((∃𝑚 ∈ 𝑉 𝑐 = (𝐹‘𝑚) ∧ ∃𝑛 ∈ 𝑉 𝑑 = (𝐹‘𝑛)) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒)))
77	27, 76	mpd 15	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))
78	77	ex 412	. . . . . . . . . 10 ⊢ ((𝜑 ∧ {𝑐, 𝑑} ∈ 𝐾) → ((𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒)))
79	16, 78	syl6bi 253	. . . . . . . . 9 ⊢ (𝑦 = {𝑐, 𝑑} → ((𝜑 ∧ 𝑦 ∈ 𝐾) → ((𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))))
80	79	impd 410	. . . . . . . 8 ⊢ (𝑦 = {𝑐, 𝑑} → (((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒)))
81	80	impcom 407	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) → ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒))
82		simpr 484	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) → 𝑦 = {𝑐, 𝑑})
83	82	adantr 480	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) ∧ 𝑒 ∈ 𝐸) → 𝑦 = {𝑐, 𝑑})
84		isomuspgrlem2.x	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐹 ∈ 𝑋)
85	84	ad4antr 729	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) ∧ 𝑒 ∈ 𝐸) → 𝐹 ∈ 𝑋)
86	1, 2, 3, 4, 5	isomuspgrlem2a 46957	. . . . . . . . . . 11 ⊢ (𝐹 ∈ 𝑋 → ∀𝑦 ∈ 𝐸 (𝐹 “ 𝑦) = (𝐺‘𝑦))
87	85, 86	syl 17	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) ∧ 𝑒 ∈ 𝐸) → ∀𝑦 ∈ 𝐸 (𝐹 “ 𝑦) = (𝐺‘𝑦))
88		imaeq2 6055	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑒 → (𝐹 “ 𝑦) = (𝐹 “ 𝑒))
89		fveq2 6891	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑒 → (𝐺‘𝑦) = (𝐺‘𝑒))
90	88, 89	eqeq12d 2747	. . . . . . . . . . . . 13 ⊢ (𝑦 = 𝑒 → ((𝐹 “ 𝑦) = (𝐺‘𝑦) ↔ (𝐹 “ 𝑒) = (𝐺‘𝑒)))
91	90	rspcv 3608	. . . . . . . . . . . 12 ⊢ (𝑒 ∈ 𝐸 → (∀𝑦 ∈ 𝐸 (𝐹 “ 𝑦) = (𝐺‘𝑦) → (𝐹 “ 𝑒) = (𝐺‘𝑒)))
92		eqcom 2738	. . . . . . . . . . . 12 ⊢ ((𝐺‘𝑒) = (𝐹 “ 𝑒) ↔ (𝐹 “ 𝑒) = (𝐺‘𝑒))
93	91, 92	imbitrrdi 251	. . . . . . . . . . 11 ⊢ (𝑒 ∈ 𝐸 → (∀𝑦 ∈ 𝐸 (𝐹 “ 𝑦) = (𝐺‘𝑦) → (𝐺‘𝑒) = (𝐹 “ 𝑒)))
94	93	adantl 481	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) ∧ 𝑒 ∈ 𝐸) → (∀𝑦 ∈ 𝐸 (𝐹 “ 𝑦) = (𝐺‘𝑦) → (𝐺‘𝑒) = (𝐹 “ 𝑒)))
95	87, 94	mpd 15	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) ∧ 𝑒 ∈ 𝐸) → (𝐺‘𝑒) = (𝐹 “ 𝑒))
96	83, 95	eqeq12d 2747	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) ∧ 𝑒 ∈ 𝐸) → (𝑦 = (𝐺‘𝑒) ↔ {𝑐, 𝑑} = (𝐹 “ 𝑒)))
97	96	rexbidva 3175	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) → (∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒) ↔ ∃𝑒 ∈ 𝐸 {𝑐, 𝑑} = (𝐹 “ 𝑒)))
98	81, 97	mpbird 257	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) ∧ 𝑦 = {𝑐, 𝑑}) → ∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒))
99	98	ex 412	. . . . 5 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐾) ∧ (𝑐 ∈ 𝑊 ∧ 𝑑 ∈ 𝑊)) → (𝑦 = {𝑐, 𝑑} → ∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒)))
100	99	rexlimdvva 3210	. . . 4 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐾) → (∃𝑐 ∈ 𝑊 ∃𝑑 ∈ 𝑊 𝑦 = {𝑐, 𝑑} → ∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒)))
101	14, 100	mpd 15	. . 3 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐾) → ∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒))
102	101	ralrimiva 3145	. 2 ⊢ (𝜑 → ∀𝑦 ∈ 𝐾 ∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒))
103		dffo3 7103	. 2 ⊢ (𝐺:𝐸–onto→𝐾 ↔ (𝐺:𝐸⟶𝐾 ∧ ∀𝑦 ∈ 𝐾 ∃𝑒 ∈ 𝐸 𝑦 = (𝐺‘𝑒)))
104	9, 102, 103	sylanbrc 582	1 ⊢ (𝜑 → 𝐺:𝐸–onto→𝐾)

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 395   ∧ w3a 1086   = wceq 1540   ∈ wcel 2105  ∀wral 3060  ∃wrex 3069  {cpr 4630   ↦ cmpt 5231   “ cima 5679   Fn wfn 6538  ⟶wf 6539  –onto→wfo 6541  –1-1-onto→wf1o 6542  ‘cfv 6543  Vtxcvtx 28690  Edgcedg 28741  UPGraphcupgr 28774  USPGraphcuspgr 28842

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2702  ax-sep 5299  ax-nul 5306  ax-pow 5363  ax-pr 5427  ax-un 7729  ax-cnex 11172  ax-resscn 11173  ax-1cn 11174  ax-icn 11175  ax-addcl 11176  ax-addrcl 11177  ax-mulcl 11178  ax-mulrcl 11179  ax-mulcom 11180  ax-addass 11181  ax-mulass 11182  ax-distr 11183  ax-i2m1 11184  ax-1ne0 11185  ax-1rid 11186  ax-rnegex 11187  ax-rrecex 11188  ax-cnre 11189  ax-pre-lttri 11190  ax-pre-lttrn 11191  ax-pre-ltadd 11192  ax-pre-mulgt0 11193

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2533  df-eu 2562  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ne 2940  df-nel 3046  df-ral 3061  df-rex 3070  df-reu 3376  df-rab 3432  df-v 3475  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-iun 4999  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5574  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-we 5633  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-pred 6300  df-ord 6367  df-on 6368  df-lim 6369  df-suc 6370  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-riota 7368  df-ov 7415  df-oprab 7416  df-mpo 7417  df-om 7860  df-1st 7979  df-2nd 7980  df-frecs 8272  df-wrecs 8303  df-recs 8377  df-rdg 8416  df-1o 8472  df-2o 8473  df-oadd 8476  df-er 8709  df-en 8946  df-dom 8947  df-sdom 8948  df-fin 8949  df-dju 9902  df-card 9940  df-pnf 11257  df-mnf 11258  df-xr 11259  df-ltxr 11260  df-le 11261  df-sub 11453  df-neg 11454  df-nn 12220  df-2 12282  df-n0 12480  df-xnn0 12552  df-z 12566  df-uz 12830  df-fz 13492  df-hash 14298  df-edg 28742  df-upgr 28776  df-uspgr 28844

This theorem is referenced by:  isomuspgrlem2e  46961