Theorem gonarlem 32754

Description: Lemma for gonar 32755 (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 7582	. . . . 5 ⊢ (𝑁 ∈ ω → suc 𝑁 ∈ ω)
2		ovexd 7170	. . . . 5 ⊢ (𝑁 ∈ ω → (𝑎⊼𝑔𝑏) ∈ V)
3		isfmlasuc 32748	. . . . 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 587	. . . 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 484	. . 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 32749	. . . . . . . . . . 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 3914	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑎 ∈ (Fmla‘suc 𝑁) → 𝑎 ∈ (Fmla‘suc suc 𝑁)))
9	7	sseld 3914	. . . . . . . . 9 ⊢ (𝑁 ∈ ω → (𝑏 ∈ (Fmla‘suc 𝑁) → 𝑏 ∈ (Fmla‘suc suc 𝑁)))
10	8, 9	anim12d 611	. . . . . . . 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 411	. . . 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 32710	. . . . . . . . . . . . . 14 ⊢ ((𝑎 ∈ V ∧ 𝑏 ∈ V) → (𝑎⊼𝑔𝑏) = ⟨1o, ⟨𝑎, 𝑏⟩⟩)
16	15	el2v 3448	. . . . . . . . . . . . 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 32710	. . . . . . . . . . . 12 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → (𝑢⊼𝑔𝑣) = ⟨1o, ⟨𝑢, 𝑣⟩⟩)
19	17, 18	eqeq12d 2814	. . . . . . . . . . 11 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ ⟨1o, ⟨𝑎, 𝑏⟩⟩ = ⟨1o, ⟨𝑢, 𝑣⟩⟩))
20		1oex 8093	. . . . . . . . . . . 12 ⊢ 1o ∈ V
21		opex 5321	. . . . . . . . . . . 12 ⊢ ⟨𝑎, 𝑏⟩ ∈ V
22	20, 21	opth 5333	. . . . . . . . . . 11 ⊢ (⟨1o, ⟨𝑎, 𝑏⟩⟩ = ⟨1o, ⟨𝑢, 𝑣⟩⟩ ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩))
23	19, 22	syl6bb 290	. . . . . . . . . 10 ⊢ ((𝑢 ∈ (Fmla‘suc 𝑁) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
24	23	adantll 713	. . . . . . . . 9 ⊢ (((𝑁 ∈ ω ∧ 𝑢 ∈ (Fmla‘suc 𝑁)) ∧ 𝑣 ∈ (Fmla‘suc 𝑁)) → ((𝑎⊼𝑔𝑏) = (𝑢⊼𝑔𝑣) ↔ (1o = 1o ∧ ⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩)))
25		vex 3444	. . . . . . . . . . . . . 14 ⊢ 𝑎 ∈ V
26		vex 3444	. . . . . . . . . . . . . 14 ⊢ 𝑏 ∈ V
27	25, 26	opth 5333	. . . . . . . . . . . . 13 ⊢ (⟨𝑎, 𝑏⟩ = ⟨𝑢, 𝑣⟩ ↔ (𝑎 = 𝑢 ∧ 𝑏 = 𝑣))
28		eleq1w 2872	. . . . . . . . . . . . . . . 16 ⊢ (𝑢 = 𝑎 → (𝑢 ∈ (Fmla‘suc 𝑁) ↔ 𝑎 ∈ (Fmla‘suc 𝑁)))
29	28	equcoms 2027	. . . . . . . . . . . . . . 15 ⊢ (𝑎 = 𝑢 → (𝑢 ∈ (Fmla‘suc 𝑁) ↔ 𝑎 ∈ (Fmla‘suc 𝑁)))
30		eleq1w 2872	. . . . . . . . . . . . . . . 16 ⊢ (𝑣 = 𝑏 → (𝑣 ∈ (Fmla‘suc 𝑁) ↔ 𝑏 ∈ (Fmla‘suc 𝑁)))
31	30	equcoms 2027	. . . . . . . . . . . . . . 15 ⊢ (𝑏 = 𝑣 → (𝑣 ∈ (Fmla‘suc 𝑁) ↔ 𝑏 ∈ (Fmla‘suc 𝑁)))
32	29, 31	bi2anan9 638	. . . . . . . . . . . . . 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 256	. . . . . . . . . . . . 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 220	. . . . . . . . . . . 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 485	. . . . . . . . . . 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 459	. . . . . . . . 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 243	. . . . . . . 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 3243	. . . . . . 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 32712	. . . . . . . . . 10 ⊢ (𝑎⊼𝑔𝑏) ≠ ∀𝑔𝑖𝑢
41		eqneqall 2998	. . . . . . . . . 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 3243	. . . . . . 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 3243	. . . . 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 484	. . . 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 243	. 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 416	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 209   ∧ wa 399   ∨ wo 844   = wceq 1538   ∈ wcel 2111   ≠ wne 2987  ∃wrex 3107  Vcvv 3441   ⊆ wss 3881  ⟨cop 4531  suc csuc 6161  ‘cfv 6324  (class class class)co 7135  ωcom 7560  1_oc1o 8078  ⊼_𝑔cgna 32694  ∀_𝑔cgol 32695  Fmlacfmla 32697

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-rep 5154  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7441  ax-inf2 9088

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-nel 3092  df-ral 3111  df-rex 3112  df-reu 3113  df-rab 3115  df-v 3443  df-sbc 3721  df-csb 3829  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-pss 3900  df-nul 4244  df-if 4426  df-pw 4499  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-uni 4801  df-iun 4883  df-br 5031  df-opab 5093  df-mpt 5111  df-tr 5137  df-id 5425  df-eprel 5430  df-po 5438  df-so 5439  df-fr 5478  df-we 5480  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-pred 6116  df-ord 6162  df-on 6163  df-lim 6164  df-suc 6165  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331  df-fv 6332  df-ov 7138  df-oprab 7139  df-mpo 7140  df-om 7561  df-1st 7671  df-2nd 7672  df-wrecs 7930  df-recs 7991  df-rdg 8029  df-1o 8085  df-2o 8086  df-map 8391  df-goel 32700  df-gona 32701  df-goal 32702  df-sat 32703  df-fmla 32705

This theorem is referenced by:  gonar  32755