Theorem recexsrlem 11056

Description: The reciprocal of a positive signed real exists. Part of Proposition 9-4.3 of [Gleason] p. 126. (Contributed by NM, 15-May-1996.) (New usage is discouraged.)

Assertion

Ref	Expression
recexsrlem	⊢ (0R <R 𝐴 → ∃𝑥 ∈ R (𝐴 ·R 𝑥) = 1R)

Distinct variable group:   𝑥,𝐴

Proof of Theorem recexsrlem

Dummy variables 𝑦 𝑧 𝑤 𝑣 𝑢 𝑓 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ltrelsr 11021	. . . 4 ⊢ <R ⊆ (R × R)
2	1	brel 5703	. . 3 ⊢ (0R <R 𝐴 → (0R ∈ R ∧ 𝐴 ∈ R))
3	2	simprd 495	. 2 ⊢ (0R <R 𝐴 → 𝐴 ∈ R)
4		df-nr 11009	. . 3 ⊢ R = ((P × P) / ~R )
5		breq2 5111	. . . 4 ⊢ ([⟨𝑦, 𝑧⟩] ~R = 𝐴 → (0R <R [⟨𝑦, 𝑧⟩] ~R ↔ 0R <R 𝐴))
6		oveq1 7394	. . . . . 6 ⊢ ([⟨𝑦, 𝑧⟩] ~R = 𝐴 → ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = (𝐴 ·R 𝑥))
7	6	eqeq1d 2731	. . . . 5 ⊢ ([⟨𝑦, 𝑧⟩] ~R = 𝐴 → (([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R ↔ (𝐴 ·R 𝑥) = 1R))
8	7	rexbidv 3157	. . . 4 ⊢ ([⟨𝑦, 𝑧⟩] ~R = 𝐴 → (∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R ↔ ∃𝑥 ∈ R (𝐴 ·R 𝑥) = 1R))
9	5, 8	imbi12d 344	. . 3 ⊢ ([⟨𝑦, 𝑧⟩] ~R = 𝐴 → ((0R <R [⟨𝑦, 𝑧⟩] ~R → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R) ↔ (0R <R 𝐴 → ∃𝑥 ∈ R (𝐴 ·R 𝑥) = 1R)))
10		gt0srpr 11031	. . . . 5 ⊢ (0R <R [⟨𝑦, 𝑧⟩] ~R ↔ 𝑧<P 𝑦)
11		ltexpri 10996	. . . . 5 ⊢ (𝑧<P 𝑦 → ∃𝑤 ∈ P (𝑧 +P 𝑤) = 𝑦)
12	10, 11	sylbi 217	. . . 4 ⊢ (0R <R [⟨𝑦, 𝑧⟩] ~R → ∃𝑤 ∈ P (𝑧 +P 𝑤) = 𝑦)
13		recexpr 11004	. . . . . 6 ⊢ (𝑤 ∈ P → ∃𝑣 ∈ P (𝑤 ·P 𝑣) = 1P)
14		1pr 10968	. . . . . . . . . . . 12 ⊢ 1P ∈ P
15		addclpr 10971	. . . . . . . . . . . 12 ⊢ ((𝑣 ∈ P ∧ 1P ∈ P) → (𝑣 +P 1P) ∈ P)
16	14, 15	mpan2 691	. . . . . . . . . . 11 ⊢ (𝑣 ∈ P → (𝑣 +P 1P) ∈ P)
17		enrex 11020	. . . . . . . . . . . 12 ⊢ ~R ∈ V
18	17, 4	ecopqsi 8744	. . . . . . . . . . 11 ⊢ (((𝑣 +P 1P) ∈ P ∧ 1P ∈ P) → [⟨(𝑣 +P 1P), 1P⟩] ~R ∈ R)
19	16, 14, 18	sylancl 586	. . . . . . . . . 10 ⊢ (𝑣 ∈ P → [⟨(𝑣 +P 1P), 1P⟩] ~R ∈ R)
20	19	ad2antlr 727	. . . . . . . . 9 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → [⟨(𝑣 +P 1P), 1P⟩] ~R ∈ R)
21	16, 14	jctir 520	. . . . . . . . . . . . . 14 ⊢ (𝑣 ∈ P → ((𝑣 +P 1P) ∈ P ∧ 1P ∈ P))
22	21	anim2i 617	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) → ((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ ((𝑣 +P 1P) ∈ P ∧ 1P ∈ P)))
23	22	adantr 480	. . . . . . . . . . . 12 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → ((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ ((𝑣 +P 1P) ∈ P ∧ 1P ∈ P)))
24		mulsrpr 11029	. . . . . . . . . . . 12 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ ((𝑣 +P 1P) ∈ P ∧ 1P ∈ P)) → ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ) = [⟨((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)), ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P)))⟩] ~R )
25	23, 24	syl 17	. . . . . . . . . . 11 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ) = [⟨((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)), ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P)))⟩] ~R )
26		oveq1 7394	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑧 +P 𝑤) = 𝑦 → ((𝑧 +P 𝑤) ·P 𝑣) = (𝑦 ·P 𝑣))
27	26	eqcomd 2735	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑧 +P 𝑤) = 𝑦 → (𝑦 ·P 𝑣) = ((𝑧 +P 𝑤) ·P 𝑣))
28		vex 3451	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑧 ∈ V
29		vex 3451	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑤 ∈ V
30		vex 3451	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 𝑣 ∈ V
31		mulcompr 10976	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑢 ·P 𝑓) = (𝑓 ·P 𝑢)
32		distrpr 10981	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑢 ·P (𝑓 +P 𝑥)) = ((𝑢 ·P 𝑓) +P (𝑢 ·P 𝑥))
33	28, 29, 30, 31, 32	caovdir 7623	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑧 +P 𝑤) ·P 𝑣) = ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑣))
34		oveq2 7395	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝑤 ·P 𝑣) = 1P → ((𝑧 ·P 𝑣) +P (𝑤 ·P 𝑣)) = ((𝑧 ·P 𝑣) +P 1P))
35	33, 34	eqtrid 2776	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝑤 ·P 𝑣) = 1P → ((𝑧 +P 𝑤) ·P 𝑣) = ((𝑧 ·P 𝑣) +P 1P))
36	27, 35	sylan9eqr 2786	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → (𝑦 ·P 𝑣) = ((𝑧 ·P 𝑣) +P 1P))
37	36	oveq1d 7402	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → ((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) = (((𝑧 ·P 𝑣) +P 1P) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))))
38		ovex 7420	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑧 ·P 𝑣) ∈ V
39	14	elexi 3470	. . . . . . . . . . . . . . . . . 18 ⊢ 1P ∈ V
40		ovex 7420	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑦 ·P 1P) +P (𝑧 ·P 1P)) ∈ V
41		addcompr 10974	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑢 +P 𝑓) = (𝑓 +P 𝑢)
42		addasspr 10975	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑢 +P 𝑓) +P 𝑥) = (𝑢 +P (𝑓 +P 𝑥))
43	38, 39, 40, 41, 42	caov32 7616	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑧 ·P 𝑣) +P 1P) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) = (((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P)
44	37, 43	eqtrdi 2780	. . . . . . . . . . . . . . . 16 ⊢ (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → ((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) = (((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P))
45	44	oveq1d 7402	. . . . . . . . . . . . . . 15 ⊢ (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → (((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P) = ((((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P) +P 1P))
46		addasspr 10975	. . . . . . . . . . . . . . 15 ⊢ ((((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P) +P 1P) = (((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P (1P +P 1P))
47	45, 46	eqtrdi 2780	. . . . . . . . . . . . . 14 ⊢ (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → (((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P) = (((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P (1P +P 1P)))
48		distrpr 10981	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 ·P (𝑣 +P 1P)) = ((𝑦 ·P 𝑣) +P (𝑦 ·P 1P))
49	48	oveq1i 7397	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) = (((𝑦 ·P 𝑣) +P (𝑦 ·P 1P)) +P (𝑧 ·P 1P))
50		addasspr 10975	. . . . . . . . . . . . . . . 16 ⊢ (((𝑦 ·P 𝑣) +P (𝑦 ·P 1P)) +P (𝑧 ·P 1P)) = ((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P)))
51	49, 50	eqtri 2752	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) = ((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P)))
52	51	oveq1i 7397	. . . . . . . . . . . . . 14 ⊢ (((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) +P 1P) = (((𝑦 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P 1P)
53		distrpr 10981	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ·P (𝑣 +P 1P)) = ((𝑧 ·P 𝑣) +P (𝑧 ·P 1P))
54	53	oveq2i 7398	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) = ((𝑦 ·P 1P) +P ((𝑧 ·P 𝑣) +P (𝑧 ·P 1P)))
55		ovex 7420	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 ·P 1P) ∈ V
56		ovex 7420	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ·P 1P) ∈ V
57	55, 38, 56, 41, 42	caov12 7617	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ·P 1P) +P ((𝑧 ·P 𝑣) +P (𝑧 ·P 1P))) = ((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P)))
58	54, 57	eqtri 2752	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) = ((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P)))
59	58	oveq1i 7397	. . . . . . . . . . . . . 14 ⊢ (((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) +P (1P +P 1P)) = (((𝑧 ·P 𝑣) +P ((𝑦 ·P 1P) +P (𝑧 ·P 1P))) +P (1P +P 1P))
60	47, 52, 59	3eqtr4g 2789	. . . . . . . . . . . . 13 ⊢ (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → (((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) +P 1P) = (((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) +P (1P +P 1P)))
61		mulclpr 10973	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑦 ∈ P ∧ (𝑣 +P 1P) ∈ P) → (𝑦 ·P (𝑣 +P 1P)) ∈ P)
62	16, 61	sylan2 593	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑦 ∈ P ∧ 𝑣 ∈ P) → (𝑦 ·P (𝑣 +P 1P)) ∈ P)
63		mulclpr 10973	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑧 ∈ P ∧ 1P ∈ P) → (𝑧 ·P 1P) ∈ P)
64	14, 63	mpan2 691	. . . . . . . . . . . . . . . . 17 ⊢ (𝑧 ∈ P → (𝑧 ·P 1P) ∈ P)
65		addclpr 10971	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑦 ·P (𝑣 +P 1P)) ∈ P ∧ (𝑧 ·P 1P) ∈ P) → ((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) ∈ P)
66	62, 64, 65	syl2an 596	. . . . . . . . . . . . . . . 16 ⊢ (((𝑦 ∈ P ∧ 𝑣 ∈ P) ∧ 𝑧 ∈ P) → ((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) ∈ P)
67	66	an32s 652	. . . . . . . . . . . . . . 15 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) → ((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) ∈ P)
68		mulclpr 10973	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑦 ∈ P ∧ 1P ∈ P) → (𝑦 ·P 1P) ∈ P)
69	14, 68	mpan2 691	. . . . . . . . . . . . . . . . 17 ⊢ (𝑦 ∈ P → (𝑦 ·P 1P) ∈ P)
70		mulclpr 10973	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑧 ∈ P ∧ (𝑣 +P 1P) ∈ P) → (𝑧 ·P (𝑣 +P 1P)) ∈ P)
71	16, 70	sylan2 593	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑧 ∈ P ∧ 𝑣 ∈ P) → (𝑧 ·P (𝑣 +P 1P)) ∈ P)
72		addclpr 10971	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑦 ·P 1P) ∈ P ∧ (𝑧 ·P (𝑣 +P 1P)) ∈ P) → ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) ∈ P)
73	69, 71, 72	syl2an 596	. . . . . . . . . . . . . . . 16 ⊢ ((𝑦 ∈ P ∧ (𝑧 ∈ P ∧ 𝑣 ∈ P)) → ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) ∈ P)
74	73	anassrs 467	. . . . . . . . . . . . . . 15 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) → ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) ∈ P)
75	67, 74	jca 511	. . . . . . . . . . . . . 14 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) → (((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) ∈ P ∧ ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) ∈ P))
76		addclpr 10971	. . . . . . . . . . . . . . . 16 ⊢ ((1P ∈ P ∧ 1P ∈ P) → (1P +P 1P) ∈ P)
77	14, 14, 76	mp2an 692	. . . . . . . . . . . . . . 15 ⊢ (1P +P 1P) ∈ P
78	77, 14	pm3.2i 470	. . . . . . . . . . . . . 14 ⊢ ((1P +P 1P) ∈ P ∧ 1P ∈ P)
79		enreceq 11019	. . . . . . . . . . . . . 14 ⊢ (((((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) ∈ P ∧ ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) ∈ P) ∧ ((1P +P 1P) ∈ P ∧ 1P ∈ P)) → ([⟨((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)), ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P)))⟩] ~R = [⟨(1P +P 1P), 1P⟩] ~R ↔ (((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) +P 1P) = (((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) +P (1P +P 1P))))
80	75, 78, 79	sylancl 586	. . . . . . . . . . . . 13 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) → ([⟨((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)), ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P)))⟩] ~R = [⟨(1P +P 1P), 1P⟩] ~R ↔ (((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)) +P 1P) = (((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P))) +P (1P +P 1P))))
81	60, 80	imbitrrid 246	. . . . . . . . . . . 12 ⊢ (((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) → (((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦) → [⟨((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)), ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P)))⟩] ~R = [⟨(1P +P 1P), 1P⟩] ~R ))
82	81	imp 406	. . . . . . . . . . 11 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → [⟨((𝑦 ·P (𝑣 +P 1P)) +P (𝑧 ·P 1P)), ((𝑦 ·P 1P) +P (𝑧 ·P (𝑣 +P 1P)))⟩] ~R = [⟨(1P +P 1P), 1P⟩] ~R )
83	25, 82	eqtrd 2764	. . . . . . . . . 10 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ) = [⟨(1P +P 1P), 1P⟩] ~R )
84		df-1r 11014	. . . . . . . . . 10 ⊢ 1R = [⟨(1P +P 1P), 1P⟩] ~R
85	83, 84	eqtr4di 2782	. . . . . . . . 9 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ) = 1R)
86		oveq2 7395	. . . . . . . . . . 11 ⊢ (𝑥 = [⟨(𝑣 +P 1P), 1P⟩] ~R → ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ))
87	86	eqeq1d 2731	. . . . . . . . . 10 ⊢ (𝑥 = [⟨(𝑣 +P 1P), 1P⟩] ~R → (([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R ↔ ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ) = 1R))
88	87	rspcev 3588	. . . . . . . . 9 ⊢ (([⟨(𝑣 +P 1P), 1P⟩] ~R ∈ R ∧ ([⟨𝑦, 𝑧⟩] ~R ·R [⟨(𝑣 +P 1P), 1P⟩] ~R ) = 1R) → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R)
89	20, 85, 88	syl2anc 584	. . . . . . . 8 ⊢ ((((𝑦 ∈ P ∧ 𝑧 ∈ P) ∧ 𝑣 ∈ P) ∧ ((𝑤 ·P 𝑣) = 1P ∧ (𝑧 +P 𝑤) = 𝑦)) → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R)
90	89	exp43 436	. . . . . . 7 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (𝑣 ∈ P → ((𝑤 ·P 𝑣) = 1P → ((𝑧 +P 𝑤) = 𝑦 → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R))))
91	90	rexlimdv 3132	. . . . . 6 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (∃𝑣 ∈ P (𝑤 ·P 𝑣) = 1P → ((𝑧 +P 𝑤) = 𝑦 → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R)))
92	13, 91	syl5 34	. . . . 5 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (𝑤 ∈ P → ((𝑧 +P 𝑤) = 𝑦 → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R)))
93	92	rexlimdv 3132	. . . 4 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (∃𝑤 ∈ P (𝑧 +P 𝑤) = 𝑦 → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R))
94	12, 93	syl5 34	. . 3 ⊢ ((𝑦 ∈ P ∧ 𝑧 ∈ P) → (0R <R [⟨𝑦, 𝑧⟩] ~R → ∃𝑥 ∈ R ([⟨𝑦, 𝑧⟩] ~R ·R 𝑥) = 1R))
95	4, 9, 94	ecoptocl 8780	. 2 ⊢ (𝐴 ∈ R → (0R <R 𝐴 → ∃𝑥 ∈ R (𝐴 ·R 𝑥) = 1R))
96	3, 95	mpcom 38	1 ⊢ (0R <R 𝐴 → ∃𝑥 ∈ R (𝐴 ·R 𝑥) = 1R)

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1540   ∈ wcel 2109  ∃wrex 3053  ⟨cop 4595   class class class wbr 5107  (class class class)co 7387  [cec 8669  Pcnp 10812  1_Pc1p 10813   +_P cpp 10814   ·_P cmp 10815  <_P cltp 10816   ~_R cer 10817  Rcnr 10818  0_Rc0r 10819  1_Rc1r 10820   ·_R cmr 10823   <_R cltr 10824

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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5251  ax-nul 5261  ax-pow 5320  ax-pr 5387  ax-un 7711  ax-inf2 9594

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rmo 3354  df-reu 3355  df-rab 3406  df-v 3449  df-sbc 3754  df-csb 3863  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-pss 3934  df-nul 4297  df-if 4489  df-pw 4565  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4872  df-int 4911  df-iun 4957  df-br 5108  df-opab 5170  df-mpt 5189  df-tr 5215  df-id 5533  df-eprel 5538  df-po 5546  df-so 5547  df-fr 5591  df-we 5593  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-rn 5649  df-res 5650  df-ima 5651  df-pred 6274  df-ord 6335  df-on 6336  df-lim 6337  df-suc 6338  df-iota 6464  df-fun 6513  df-fn 6514  df-f 6515  df-f1 6516  df-fo 6517  df-f1o 6518  df-fv 6519  df-ov 7390  df-oprab 7391  df-mpo 7392  df-om 7843  df-1st 7968  df-2nd 7969  df-frecs 8260  df-wrecs 8291  df-recs 8340  df-rdg 8378  df-1o 8434  df-oadd 8438  df-omul 8439  df-er 8671  df-ec 8673  df-qs 8677  df-ni 10825  df-pli 10826  df-mi 10827  df-lti 10828  df-plpq 10861  df-mpq 10862  df-ltpq 10863  df-enq 10864  df-nq 10865  df-erq 10866  df-plq 10867  df-mq 10868  df-1nq 10869  df-rq 10870  df-ltnq 10871  df-np 10934  df-1p 10935  df-plp 10936  df-mp 10937  df-ltp 10938  df-enr 11008  df-nr 11009  df-mr 11011  df-ltr 11012  df-0r 11013  df-1r 11014

This theorem is referenced by:  recexsr  11060