Theorem gonarlem 33356

Description: Lemma for gonar 33357 (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 7737	. . . . 5 ⊢ (𝑁 ∈ ω → suc 𝑁 ∈ ω)
2		ovexd 7310	. . . . 5 ⊢ (𝑁 ∈ ω → (𝑎⊼𝑔𝑏) ∈ V)
3		isfmlasuc 33350	. . . . 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 33351	. . . . . . . . . . 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 3920	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc 𝑁) → 𝑎 ∈ (Fmla‘suc suc 𝑁)))
9	7	sseld 3920	. . . . . . . . 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 33312	. . . . . . . . . . . . . 14 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎⊼𝑔𝑏) = ⟨1o, ⟨𝑎, 𝑏⟩⟩)
16	15	el2v 3440	. . . . . . . . . . . . 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 33312	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑢⊼𝑔𝑣) = ⟨1o, ⟨𝑢, 𝑣⟩⟩)
19	17, 18	eqeq12d 2754	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ ⟨1o, ⟨𝑎, 𝑏⟩⟩ = ⟨1o, ⟨𝑢, 𝑣⟩⟩))
20		1oex 8307	. . . . . . . . . . . 12 ⊢ 1o ∈ V
21		opex 5379	. . . . . . . . . . . 12 ⊢ ⟨𝑎, 𝑏⟩ ∈ V
22	20, 21	opth 5391	. . . . . . . . . . 11 ⊢ (⟨1o, ⟨𝑎, 𝑏⟩⟩ = ⟨1o, ⟨𝑢, 𝑣⟩⟩ ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩))
23	19, 22	bitrdi 287	. . . . . . . . . 10 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
24	23	adantll 711	. . . . . . . . 9 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
25		vex 3436	. . . . . . . . . . . . . 14 ⊢ 𝑎 ∈ V
26		vex 3436	. . . . . . . . . . . . . 14 ⊢ 𝑏 ∈ V
27	25, 26	opth 5391	. . . . . . . . . . . . 13 ⊢ (⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩ ↔ (𝑎 = 𝑢 ∧ 𝑏 = 𝑣))
28		eleq1w 2821	. . . . . . . . . . . . . . . 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 2821	. . . . . . . . . . . . . . . 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 636	. . . . . . . . . . . . . 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 ⊢ ((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 456	. . . . . . . . 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 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 3213	. . . . . . 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 33314	. . . . . . . . . 10 ⊢ (𝑎⊼𝑔𝑏) ≠ ∀𝑔𝑖𝑢
41		eqneqall 2954	. . . . . . . . . 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 3213	. . . . . . 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 856	. . . . . 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 3213	. . . . 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 856	. . 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)))))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   ∨ wo 844   = wceq 1539   ∈ wcel 2106   ≠ wne 2943  ∃wrex 3065  Vcvv 3432   ⊆ wss 3887  ⟨cop 4567  suc csuc 6268  ‘cfv 6433  (class class class)co 7275  ωcom 7712  1_oc1o 8290  ⊼_𝑔cgna 33296  ∀_𝑔cgol 33297  Fmlacfmla 33299

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  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 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588  ax-inf2 9399

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3or 1087  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-nel 3050  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-pss 3906  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-tr 5192  df-id 5489  df-eprel 5495  df-po 5503  df-so 5504  df-fr 5544  df-we 5546  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-pred 6202  df-ord 6269  df-on 6270  df-lim 6271  df-suc 6272  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-ov 7278  df-oprab 7279  df-mpo 7280  df-om 7713  df-1st 7831  df-2nd 7832  df-frecs 8097  df-wrecs 8128  df-recs 8202  df-rdg 8241  df-1o 8297  df-2o 8298  df-map 8617  df-goel 33302  df-gona 33303  df-goal 33304  df-sat 33305  df-fmla 33307

This theorem is referenced by:  gonar  33357