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Theorem gonarlem 34373

Description: Lemma for gonar 34374 (induction step). (Contributed by AV, 21-Oct-2023.)

**Assertion**
Ref	Expression
gonarlem	⊢ (𝑁 ∈ ω → (((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁))) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc suc 𝑁) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))

Distinct variable group: 𝑎,𝑏 Allowed substitution hints: 𝑁(𝑎,𝑏)

Proof of Theorem gonarlem Dummy variables 𝑖 𝑢 𝑣 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		peano2 7877	. . . . 5 ⊢ (𝑁 ∈ ω → suc 𝑁 ∈ ω)
2		ovexd 7440	. . . . 5 ⊢ (𝑁 ∈ ω → (𝑎⊼_𝑔𝑏) ∈ V)
3		isfmlasuc 34367	. . . . 5 ⊢ ((suc 𝑁 ∈ ω ∧ (𝑎⊼_𝑔𝑏) ∈ V) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc suc 𝑁) ↔ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) ∨ ∃𝑢 ∈ (Fmla‘suc 𝑁)(∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢))))
4	1, 2, 3	syl2anc 584	. . . 4 ⊢ (𝑁 ∈ ω → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc suc 𝑁) ↔ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) ∨ ∃𝑢 ∈ (Fmla‘suc 𝑁)(∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢))))
5	4	adantr 481	. . 3 ⊢ ((𝑁 ∈ ω ∧ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)))) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc suc 𝑁) ↔ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) ∨ ∃𝑢 ∈ (Fmla‘suc 𝑁)(∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢))))
6		fmlasssuc 34368	. . . . . . . . . . 11 ⊢ (suc 𝑁 ∈ ω → (Fmla‘suc 𝑁) ⊆ (Fmla‘suc suc 𝑁))
7	1, 6	syl 17	. . . . . . . . . 10 ⊢ (𝑁 ∈ ω → (Fmla‘suc 𝑁) ⊆ (Fmla‘suc suc 𝑁))
8	7	sseld 3980	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc 𝑁) → 𝑎 ∈ (Fmla‘suc suc 𝑁)))
9	7	sseld 3980	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑏 ∈ (Fmla‘suc 𝑁) → 𝑏 ∈ (Fmla‘suc suc 𝑁)))
10	8, 9	anim12d 609	. . . . . . . 8 ⊢ (𝑁 ∈ ω → ((𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
11	10	com12 32	. . . . . . 7 ⊢ ((𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)) → (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
12	11	imim2i 16	. . . . . 6 ⊢ (((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁))) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
13	12	com23 86	. . . . 5 ⊢ (((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁))) → (𝑁 ∈ ω → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
14	13	impcom 408	. . . 4 ⊢ ((𝑁 ∈ ω ∧ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)))) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
15		gonafv 34329	. . . . . . . . . . . . . 14 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎⊼_𝑔𝑏) = ⟨1_o, ⟨𝑎, 𝑏⟩⟩)
16	15	el2v 3482	. . . . . . . . . . . . 13 ⊢ (𝑎⊼_𝑔𝑏) = ⟨1_o, ⟨𝑎, 𝑏⟩⟩
17	16	a1i 11	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑎⊼_𝑔𝑏) = ⟨1_o, ⟨𝑎, 𝑏⟩⟩)
18		gonafv 34329	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑢⊼_𝑔𝑣) = ⟨1_o, ⟨𝑢, 𝑣⟩⟩)
19	17, 18	eqeq12d 2748	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ↔ ⟨1_o, ⟨𝑎, 𝑏⟩⟩ = ⟨1_o, ⟨𝑢, 𝑣⟩⟩))
20		1oex 8472	. . . . . . . . . . . 12 ⊢ 1_o ∈ V
21		opex 5463	. . . . . . . . . . . 12 ⊢ ⟨𝑎, 𝑏⟩ ∈ V
22	20, 21	opth 5475	. . . . . . . . . . 11 ⊢ (⟨1_o, ⟨𝑎, 𝑏⟩⟩ = ⟨1_o, ⟨𝑢, 𝑣⟩⟩ ↔ (1_o = 1_o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩))
23	19, 22	bitrdi 286	. . . . . . . . . 10 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ↔ (1_o = 1_o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
24	23	adantll 712	. . . . . . . . 9 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ↔ (1_o = 1_o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
25		vex 3478	. . . . . . . . . . . . . 14 ⊢ 𝑎 ∈ V
26		vex 3478	. . . . . . . . . . . . . 14 ⊢ 𝑏 ∈ V
27	25, 26	opth 5475	. . . . . . . . . . . . 13 ⊢ (⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩ ↔ (𝑎 = 𝑢 ∧ 𝑏 = 𝑣))
28		eleq1w 2816	. . . . . . . . . . . . . . . 16 ⊢ (𝑢 = 𝑎 → (𝑢 ∈ (Fmla‘suc 𝑁) ↔ 𝑎 ∈ (Fmla‘suc 𝑁)))
29	28	equcoms 2023	. . . . . . . . . . . . . . 15 ⊢ (𝑎 = 𝑢 → (𝑢 ∈ (Fmla‘suc 𝑁) ↔ 𝑎 ∈ (Fmla‘suc 𝑁)))
30		eleq1w 2816	. . . . . . . . . . . . . . . 16 ⊢ (𝑣 = 𝑏 → (𝑣 ∈ (Fmla‘suc 𝑁) ↔ 𝑏 ∈ (Fmla‘suc 𝑁)))
31	30	equcoms 2023	. . . . . . . . . . . . . . 15 ⊢ (𝑏 = 𝑣 → (𝑣 ∈ (Fmla‘suc 𝑁) ↔ 𝑏 ∈ (Fmla‘suc 𝑁)))
32	29, 31	bi2anan9 637	. . . . . . . . . . . . . 14 ⊢ ((𝑎 = 𝑢 ∧ 𝑏 = 𝑣) → ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) ↔ (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁))))
33	32, 11	syl6bi 252	. . . . . . . . . . . . 13 ⊢ ((𝑎 = 𝑢 ∧ 𝑏 = 𝑣) → ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
34	27, 33	sylbi 216	. . . . . . . . . . . 12 ⊢ (⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩ → ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
35	34	adantl 482	. . . . . . . . . . 11 ⊢ ((1_o = 1_o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩) → ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
36	35	com13 88	. . . . . . . . . 10 ⊢ (𝑁 ∈ ω → ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((1_o = 1_o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
37	36	impl 456	. . . . . . . . 9 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((1_o = 1_o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
38	24, 37	sylbid 239	. . . . . . . 8 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
39	38	rexlimdva 3155	. . . . . . 7 ⊢ ((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) → (∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
40		gonanegoal 34331	. . . . . . . . . 10 ⊢ (𝑎⊼_𝑔𝑏) ≠ ∀_𝑔𝑖𝑢
41		eqneqall 2951	. . . . . . . . . 10 ⊢ ((𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢 → ((𝑎⊼_𝑔𝑏) ≠ ∀_𝑔𝑖𝑢 → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
42	40, 41	mpi 20	. . . . . . . . 9 ⊢ ((𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢 → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))
43	42	a1i 11	. . . . . . . 8 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑖 ∈ ω) → ((𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢 → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
44	43	rexlimdva 3155	. . . . . . 7 ⊢ ((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) → (∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢 → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
45	39, 44	jaod 857	. . . . . 6 ⊢ ((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) → ((∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
46	45	rexlimdva 3155	. . . . 5 ⊢ (𝑁 ∈ ω → (∃𝑢 ∈ (Fmla‘suc 𝑁)(∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
47	46	adantr 481	. . . 4 ⊢ ((𝑁 ∈ ω ∧ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)))) → (∃𝑢 ∈ (Fmla‘suc 𝑁)(∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
48	14, 47	jaod 857	. . 3 ⊢ ((𝑁 ∈ ω ∧ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)))) → (((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) ∨ ∃𝑢 ∈ (Fmla‘suc 𝑁)(∃𝑣 ∈ (Fmla‘suc 𝑁)(𝑎⊼_𝑔𝑏) = (𝑢⊼_𝑔𝑣) ∨ ∃𝑖 ∈ ω (𝑎⊼_𝑔𝑏) = ∀_𝑔𝑖𝑢)) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
49	5, 48	sylbid 239	. 2 ⊢ ((𝑁 ∈ ω ∧ ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁)))) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc suc 𝑁) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
50	49	ex 413	1 ⊢ (𝑁 ∈ ω → (((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc 𝑁) → (𝑎 ∈ (Fmla‘suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc 𝑁))) → ((𝑎⊼_𝑔𝑏) ∈ (Fmla‘suc suc 𝑁) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∨ wo 845 = wceq 1541 ∈ wcel 2106 ≠ wne 2940 ∃wrex 3070 Vcvv 3474 ⊆ wss 3947 ⟨cop 4633 suc csuc 6363 ‘cfv 6540 (class class class)co 7405 ωcom 7851 1_oc1o 8455 ⊼_𝑔cgna 34313 ∀_𝑔cgol 34314 Fmlacfmla 34316

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-inf2 9632

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-uni 4908 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-map 8818 df-goel 34319 df-gona 34320 df-goal 34321 df-sat 34322 df-fmla 34324

This theorem is referenced by: gonar 34374

W3C validator