Theorem gonarlem 32662

Description: Lemma for gonar 32663 (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 7595	. . . . 5 ⊢ (𝑁 ∈ ω → suc 𝑁 ∈ ω)
2		ovexd 7184	. . . . 5 ⊢ (𝑁 ∈ ω → (𝑎⊼𝑔𝑏) ∈ V)
3		isfmlasuc 32656	. . . . 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 586	. . . 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 483	. . 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 32657	. . . . . . . . . . 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 3959	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc 𝑁) → 𝑎 ∈ (Fmla‘suc suc 𝑁)))
9	7	sseld 3959	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑏 ∈ (Fmla‘suc 𝑁) → 𝑏 ∈ (Fmla‘suc suc 𝑁)))
10	8, 9	anim12d 610	. . . . . . . 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 410	. . . 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 32618	. . . . . . . . . . . . . 14 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎⊼𝑔𝑏) = ⟨1o, ⟨𝑎, 𝑏⟩⟩)
16	15	el2v 3498	. . . . . . . . . . . . 13 ⊢ (𝑎⊼𝑔𝑏) = ⟨1o, ⟨𝑎, 𝑏⟩⟩
17	16	a1i 11	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑎⊼𝑔𝑏) = ⟨1o, ⟨𝑎, 𝑏⟩⟩)
18		gonafv 32618	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑢⊼𝑔𝑣) = ⟨1o, ⟨𝑢, 𝑣⟩⟩)
19	17, 18	eqeq12d 2836	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ ⟨1o, ⟨𝑎, 𝑏⟩⟩ = ⟨1o, ⟨𝑢, 𝑣⟩⟩))
20		1oex 8103	. . . . . . . . . . . 12 ⊢ 1o ∈ V
21		opex 5349	. . . . . . . . . . . 12 ⊢ ⟨𝑎, 𝑏⟩ ∈ V
22	20, 21	opth 5361	. . . . . . . . . . 11 ⊢ (⟨1o, ⟨𝑎, 𝑏⟩⟩ = ⟨1o, ⟨𝑢, 𝑣⟩⟩ ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩))
23	19, 22	syl6bb 289	. . . . . . . . . 10 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
24	23	adantll 712	. . . . . . . . 9 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
25		vex 3494	. . . . . . . . . . . . . 14 ⊢ 𝑎 ∈ V
26		vex 3494	. . . . . . . . . . . . . 14 ⊢ 𝑏 ∈ V
27	25, 26	opth 5361	. . . . . . . . . . . . 13 ⊢ (⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩ ↔ (𝑎 = 𝑢 ∧ 𝑏 = 𝑣))
28		eleq1w 2894	. . . . . . . . . . . . . . . 16 ⊢ (𝑢 = 𝑎 → (𝑢 ∈ (Fmla‘suc 𝑁) ↔ 𝑎 ∈ (Fmla‘suc 𝑁)))
29	28	equcoms 2026	. . . . . . . . . . . . . . 15 ⊢ (𝑎 = 𝑢 → (𝑢 ∈ (Fmla‘suc 𝑁) ↔ 𝑎 ∈ (Fmla‘suc 𝑁)))
30		eleq1w 2894	. . . . . . . . . . . . . . . 16 ⊢ (𝑣 = 𝑏 → (𝑣 ∈ (Fmla‘suc 𝑁) ↔ 𝑏 ∈ (Fmla‘suc 𝑁)))
31	30	equcoms 2026	. . . . . . . . . . . . . . 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 255	. . . . . . . . . . . . 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 219	. . . . . . . . . . . 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 484	. . . . . . . . . . 11 ⊢ ((1o = 1o ∧ ⟨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)) → ((1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁)))))
37	36	impl 458	. . . . . . . . 9 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩) → (𝑎 ∈ (Fmla‘suc suc 𝑁) ∧ 𝑏 ∈ (Fmla‘suc suc 𝑁))))
38	24, 37	sylbid 242	. . . . . . . 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 3283	. . . . . . 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 32620	. . . . . . . . . 10 ⊢ (𝑎⊼𝑔𝑏) ≠ ∀𝑔𝑖𝑢
41		eqneqall 3026	. . . . . . . . . 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 3283	. . . . . . 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 855	. . . . . 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 3283	. . . . 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 483	. . . 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 855	. . 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 242	. 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 415	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)))))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   = wceq 1536   ∈ wcel 2113   ≠ wne 3015  ∃wrex 3138  Vcvv 3491   ⊆ wss 3929  ⟨cop 4566  suc csuc 6186  ‘cfv 6348  (class class class)co 7149  ωcom 7573  1_oc1o 8088  ⊼_𝑔cgna 32602  ∀_𝑔cgol 32603  Fmlacfmla 32605

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454  ax-inf2 9097

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1083  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-nel 3123  df-ral 3142  df-rex 3143  df-reu 3144  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-pss 3947  df-nul 4285  df-if 4461  df-pw 4534  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-tr 5166  df-id 5453  df-eprel 5458  df-po 5467  df-so 5468  df-fr 5507  df-we 5509  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-pred 6141  df-ord 6187  df-on 6188  df-lim 6189  df-suc 6190  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-ov 7152  df-oprab 7153  df-mpo 7154  df-om 7574  df-1st 7682  df-2nd 7683  df-wrecs 7940  df-recs 8001  df-rdg 8039  df-1o 8095  df-2o 8096  df-map 8401  df-goel 32608  df-gona 32609  df-goal 32610  df-sat 32611  df-fmla 32613

This theorem is referenced by:  gonar  32663