Theorem ltexprlemm 7562

Description: Our constructed difference is inhabited. Lemma for ltexpri 7575. (Contributed by Jim Kingdon, 17-Dec-2019.)

Hypothesis

Ref	Expression
ltexprlem.1	⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑥) ∈ (1st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑥) ∈ (2nd ‘𝐵))}⟩

Assertion

Ref	Expression
ltexprlemm	⊢ (𝐴<P 𝐵 → (∃𝑞 ∈ Q 𝑞 ∈ (1st ‘𝐶) ∧ ∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐶)))

Distinct variable groups:   𝑥,𝑦,𝑞,𝑟,𝐴   𝑥,𝐵,𝑦,𝑞,𝑟   𝑥,𝐶,𝑦,𝑞,𝑟

Proof of Theorem ltexprlemm

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ltrelpr 7467	. . . . . . . . 9 ⊢ <P ⊆ (P × P)
2	1	brel 4663	. . . . . . . 8 ⊢ (𝐴<P 𝐵 → (𝐴 ∈ P ∧ 𝐵 ∈ P))
3		ltdfpr 7468	. . . . . . . . 9 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → (𝐴<P 𝐵 ↔ ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵))))
4	3	biimpd 143	. . . . . . . 8 ⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P) → (𝐴<P 𝐵 → ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵))))
5	2, 4	mpcom 36	. . . . . . 7 ⊢ (𝐴<P 𝐵 → ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵)))
6		simprrl 534	. . . . . . . . . 10 ⊢ ((𝐴<P 𝐵 ∧ (𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵)))) → 𝑦 ∈ (2nd ‘𝐴))
7	2	simprd 113	. . . . . . . . . . . . 13 ⊢ (𝐴<P 𝐵 → 𝐵 ∈ P)
8		prop 7437	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 ∈ P → ⟨(1st ‘𝐵), (2nd ‘𝐵)⟩ ∈ P)
9		prnmaxl 7450	. . . . . . . . . . . . . . . . . 18 ⊢ ((⟨(1st ‘𝐵), (2nd ‘𝐵)⟩ ∈ P ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑤 ∈ (1st ‘𝐵)𝑦 <Q 𝑤)
10	8, 9	sylan 281	. . . . . . . . . . . . . . . . 17 ⊢ ((𝐵 ∈ P ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑤 ∈ (1st ‘𝐵)𝑦 <Q 𝑤)
11		ltexnqi 7371	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑦 <Q 𝑤 → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤)
12	11	reximi 2567	. . . . . . . . . . . . . . . . 17 ⊢ (∃𝑤 ∈ (1st ‘𝐵)𝑦 <Q 𝑤 → ∃𝑤 ∈ (1st ‘𝐵)∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤)
13	10, 12	syl 14	. . . . . . . . . . . . . . . 16 ⊢ ((𝐵 ∈ P ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑤 ∈ (1st ‘𝐵)∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤)
14		df-rex 2454	. . . . . . . . . . . . . . . 16 ⊢ (∃𝑤 ∈ (1st ‘𝐵)∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤 ↔ ∃𝑤(𝑤 ∈ (1st ‘𝐵) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤))
15	13, 14	sylib 121	. . . . . . . . . . . . . . 15 ⊢ ((𝐵 ∈ P ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑤(𝑤 ∈ (1st ‘𝐵) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤))
16		r19.42v 2627	. . . . . . . . . . . . . . . 16 ⊢ (∃𝑞 ∈ Q (𝑤 ∈ (1st ‘𝐵) ∧ (𝑦 +Q 𝑞) = 𝑤) ↔ (𝑤 ∈ (1st ‘𝐵) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤))
17	16	exbii 1598	. . . . . . . . . . . . . . 15 ⊢ (∃𝑤∃𝑞 ∈ Q (𝑤 ∈ (1st ‘𝐵) ∧ (𝑦 +Q 𝑞) = 𝑤) ↔ ∃𝑤(𝑤 ∈ (1st ‘𝐵) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) = 𝑤))
18	15, 17	sylibr 133	. . . . . . . . . . . . . 14 ⊢ ((𝐵 ∈ P ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑤∃𝑞 ∈ Q (𝑤 ∈ (1st ‘𝐵) ∧ (𝑦 +Q 𝑞) = 𝑤))
19		eleq1 2233	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑦 +Q 𝑞) = 𝑤 → ((𝑦 +Q 𝑞) ∈ (1st ‘𝐵) ↔ 𝑤 ∈ (1st ‘𝐵)))
20	19	biimparc 297	. . . . . . . . . . . . . . . 16 ⊢ ((𝑤 ∈ (1st ‘𝐵) ∧ (𝑦 +Q 𝑞) = 𝑤) → (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
21	20	reximi 2567	. . . . . . . . . . . . . . 15 ⊢ (∃𝑞 ∈ Q (𝑤 ∈ (1st ‘𝐵) ∧ (𝑦 +Q 𝑞) = 𝑤) → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
22	21	exlimiv 1591	. . . . . . . . . . . . . 14 ⊢ (∃𝑤∃𝑞 ∈ Q (𝑤 ∈ (1st ‘𝐵) ∧ (𝑦 +Q 𝑞) = 𝑤) → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
23	18, 22	syl 14	. . . . . . . . . . . . 13 ⊢ ((𝐵 ∈ P ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
24	7, 23	sylan 281	. . . . . . . . . . . 12 ⊢ ((𝐴<P 𝐵 ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
25	24	adantrl 475	. . . . . . . . . . 11 ⊢ ((𝐴<P 𝐵 ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵))) → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
26	25	adantrl 475	. . . . . . . . . 10 ⊢ ((𝐴<P 𝐵 ∧ (𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵)))) → ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))
27	6, 26	jca 304	. . . . . . . . 9 ⊢ ((𝐴<P 𝐵 ∧ (𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵)))) → (𝑦 ∈ (2nd ‘𝐴) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
28	27	expr 373	. . . . . . . 8 ⊢ ((𝐴<P 𝐵 ∧ 𝑦 ∈ Q) → ((𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵)) → (𝑦 ∈ (2nd ‘𝐴) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
29	28	reximdva 2572	. . . . . . 7 ⊢ (𝐴<P 𝐵 → (∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ 𝑦 ∈ (1st ‘𝐵)) → ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
30	5, 29	mpd 13	. . . . . 6 ⊢ (𝐴<P 𝐵 → ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
31		r19.42v 2627	. . . . . . 7 ⊢ (∃𝑞 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ (𝑦 ∈ (2nd ‘𝐴) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
32	31	rexbii 2477	. . . . . 6 ⊢ (∃𝑦 ∈ Q ∃𝑞 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ ∃𝑞 ∈ Q (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
33	30, 32	sylibr 133	. . . . 5 ⊢ (𝐴<P 𝐵 → ∃𝑦 ∈ Q ∃𝑞 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
34		rexcom 2634	. . . . 5 ⊢ (∃𝑦 ∈ Q ∃𝑞 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑞 ∈ Q ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
35	33, 34	sylib 121	. . . 4 ⊢ (𝐴<P 𝐵 → ∃𝑞 ∈ Q ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
36	2	simpld 111	. . . . . . . . . . . 12 ⊢ (𝐴<P 𝐵 → 𝐴 ∈ P)
37		prop 7437	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ P → ⟨(1st ‘𝐴), (2nd ‘𝐴)⟩ ∈ P)
38		elprnqu 7444	. . . . . . . . . . . . 13 ⊢ ((⟨(1st ‘𝐴), (2nd ‘𝐴)⟩ ∈ P ∧ 𝑦 ∈ (2nd ‘𝐴)) → 𝑦 ∈ Q)
39	37, 38	sylan 281	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ P ∧ 𝑦 ∈ (2nd ‘𝐴)) → 𝑦 ∈ Q)
40	36, 39	sylan 281	. . . . . . . . . . 11 ⊢ ((𝐴<P 𝐵 ∧ 𝑦 ∈ (2nd ‘𝐴)) → 𝑦 ∈ Q)
41	40	ex 114	. . . . . . . . . 10 ⊢ (𝐴<P 𝐵 → (𝑦 ∈ (2nd ‘𝐴) → 𝑦 ∈ Q))
42	41	pm4.71rd 392	. . . . . . . . 9 ⊢ (𝐴<P 𝐵 → (𝑦 ∈ (2nd ‘𝐴) ↔ (𝑦 ∈ Q ∧ 𝑦 ∈ (2nd ‘𝐴))))
43	42	anbi1d 462	. . . . . . . 8 ⊢ (𝐴<P 𝐵 → ((𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ((𝑦 ∈ Q ∧ 𝑦 ∈ (2nd ‘𝐴)) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
44		anass 399	. . . . . . . 8 ⊢ (((𝑦 ∈ Q ∧ 𝑦 ∈ (2nd ‘𝐴)) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ (𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
45	43, 44	bitrdi 195	. . . . . . 7 ⊢ (𝐴<P 𝐵 → ((𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ (𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))))
46	45	exbidv 1818	. . . . . 6 ⊢ (𝐴<P 𝐵 → (∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑦(𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))))
47	46	rexbidv 2471	. . . . 5 ⊢ (𝐴<P 𝐵 → (∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))))
48		df-rex 2454	. . . . . 6 ⊢ (∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑦(𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
49	48	rexbii 2477	. . . . 5 ⊢ (∃𝑞 ∈ Q ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ Q ∧ (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
50	47, 49	bitr4di 197	. . . 4 ⊢ (𝐴<P 𝐵 → (∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑞 ∈ Q ∃𝑦 ∈ Q (𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
51	35, 50	mpbird 166	. . 3 ⊢ (𝐴<P 𝐵 → ∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
52		ltexprlem.1	. . . . . 6 ⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑥) ∈ (1st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑥) ∈ (2nd ‘𝐵))}⟩
53	52	ltexprlemell 7560	. . . . 5 ⊢ (𝑞 ∈ (1st ‘𝐶) ↔ (𝑞 ∈ Q ∧ ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
54	53	rexbii 2477	. . . 4 ⊢ (∃𝑞 ∈ Q 𝑞 ∈ (1st ‘𝐶) ↔ ∃𝑞 ∈ Q (𝑞 ∈ Q ∧ ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
55		ssid 3167	. . . . 5 ⊢ Q ⊆ Q
56		rexss 3214	. . . . 5 ⊢ (Q ⊆ Q → (∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑞 ∈ Q (𝑞 ∈ Q ∧ ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))))
57	55, 56	ax-mp 5	. . . 4 ⊢ (∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)) ↔ ∃𝑞 ∈ Q (𝑞 ∈ Q ∧ ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵))))
58	54, 57	bitr4i 186	. . 3 ⊢ (∃𝑞 ∈ Q 𝑞 ∈ (1st ‘𝐶) ↔ ∃𝑞 ∈ Q ∃𝑦(𝑦 ∈ (2nd ‘𝐴) ∧ (𝑦 +Q 𝑞) ∈ (1st ‘𝐵)))
59	51, 58	sylibr 133	. 2 ⊢ (𝐴<P 𝐵 → ∃𝑞 ∈ Q 𝑞 ∈ (1st ‘𝐶))
60		nfv 1521	. . 3 ⊢ Ⅎ𝑟 𝐴<P 𝐵
61		nfre1 2513	. . 3 ⊢ Ⅎ𝑟∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐶)
62		prmu 7440	. . . . 5 ⊢ (⟨(1st ‘𝐵), (2nd ‘𝐵)⟩ ∈ P → ∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐵))
63		rexex 2516	. . . . 5 ⊢ (∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐵) → ∃𝑟 𝑟 ∈ (2nd ‘𝐵))
64	62, 63	syl 14	. . . 4 ⊢ (⟨(1st ‘𝐵), (2nd ‘𝐵)⟩ ∈ P → ∃𝑟 𝑟 ∈ (2nd ‘𝐵))
65	7, 8, 64	3syl 17	. . 3 ⊢ (𝐴<P 𝐵 → ∃𝑟 𝑟 ∈ (2nd ‘𝐵))
66		elprnqu 7444	. . . . . . 7 ⊢ ((⟨(1st ‘𝐵), (2nd ‘𝐵)⟩ ∈ P ∧ 𝑟 ∈ (2nd ‘𝐵)) → 𝑟 ∈ Q)
67	8, 66	sylan 281	. . . . . 6 ⊢ ((𝐵 ∈ P ∧ 𝑟 ∈ (2nd ‘𝐵)) → 𝑟 ∈ Q)
68	7, 67	sylan 281	. . . . 5 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) → 𝑟 ∈ Q)
69		prml 7439	. . . . . . . . 9 ⊢ (⟨(1st ‘𝐴), (2nd ‘𝐴)⟩ ∈ P → ∃𝑦 ∈ Q 𝑦 ∈ (1st ‘𝐴))
70	37, 69	syl 14	. . . . . . . 8 ⊢ (𝐴 ∈ P → ∃𝑦 ∈ Q 𝑦 ∈ (1st ‘𝐴))
71		rexex 2516	. . . . . . . 8 ⊢ (∃𝑦 ∈ Q 𝑦 ∈ (1st ‘𝐴) → ∃𝑦 𝑦 ∈ (1st ‘𝐴))
72	36, 70, 71	3syl 17	. . . . . . 7 ⊢ (𝐴<P 𝐵 → ∃𝑦 𝑦 ∈ (1st ‘𝐴))
73	72	adantr 274	. . . . . 6 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) → ∃𝑦 𝑦 ∈ (1st ‘𝐴))
74	68	3adant3 1012	. . . . . . . . 9 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑟 ∈ Q)
75		simp3 994	. . . . . . . . . 10 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑦 ∈ (1st ‘𝐴))
76		elprnql 7443	. . . . . . . . . . . . . . 15 ⊢ ((⟨(1st ‘𝐴), (2nd ‘𝐴)⟩ ∈ P ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑦 ∈ Q)
77	37, 76	sylan 281	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ P ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑦 ∈ Q)
78	36, 77	sylan 281	. . . . . . . . . . . . 13 ⊢ ((𝐴<P 𝐵 ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑦 ∈ Q)
79	78	3adant2 1011	. . . . . . . . . . . 12 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑦 ∈ Q)
80		addcomnqg 7343	. . . . . . . . . . . 12 ⊢ ((𝑟 ∈ Q ∧ 𝑦 ∈ Q) → (𝑟 +Q 𝑦) = (𝑦 +Q 𝑟))
81	74, 79, 80	syl2anc 409	. . . . . . . . . . 11 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → (𝑟 +Q 𝑦) = (𝑦 +Q 𝑟))
82		ltaddnq 7369	. . . . . . . . . . . . 13 ⊢ ((𝑟 ∈ Q ∧ 𝑦 ∈ Q) → 𝑟 <Q (𝑟 +Q 𝑦))
83	74, 79, 82	syl2anc 409	. . . . . . . . . . . 12 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑟 <Q (𝑟 +Q 𝑦))
84		prcunqu 7447	. . . . . . . . . . . . . . 15 ⊢ ((⟨(1st ‘𝐵), (2nd ‘𝐵)⟩ ∈ P ∧ 𝑟 ∈ (2nd ‘𝐵)) → (𝑟 <Q (𝑟 +Q 𝑦) → (𝑟 +Q 𝑦) ∈ (2nd ‘𝐵)))
85	8, 84	sylan 281	. . . . . . . . . . . . . 14 ⊢ ((𝐵 ∈ P ∧ 𝑟 ∈ (2nd ‘𝐵)) → (𝑟 <Q (𝑟 +Q 𝑦) → (𝑟 +Q 𝑦) ∈ (2nd ‘𝐵)))
86	7, 85	sylan 281	. . . . . . . . . . . . 13 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) → (𝑟 <Q (𝑟 +Q 𝑦) → (𝑟 +Q 𝑦) ∈ (2nd ‘𝐵)))
87	86	3adant3 1012	. . . . . . . . . . . 12 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → (𝑟 <Q (𝑟 +Q 𝑦) → (𝑟 +Q 𝑦) ∈ (2nd ‘𝐵)))
88	83, 87	mpd 13	. . . . . . . . . . 11 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → (𝑟 +Q 𝑦) ∈ (2nd ‘𝐵))
89	81, 88	eqeltrrd 2248	. . . . . . . . . 10 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → (𝑦 +Q 𝑟) ∈ (2nd ‘𝐵))
90		19.8a 1583	. . . . . . . . . 10 ⊢ ((𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑟) ∈ (2nd ‘𝐵)) → ∃𝑦(𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑟) ∈ (2nd ‘𝐵)))
91	75, 89, 90	syl2anc 409	. . . . . . . . 9 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → ∃𝑦(𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑟) ∈ (2nd ‘𝐵)))
92	74, 91	jca 304	. . . . . . . 8 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → (𝑟 ∈ Q ∧ ∃𝑦(𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑟) ∈ (2nd ‘𝐵))))
93	52	ltexprlemelu 7561	. . . . . . . 8 ⊢ (𝑟 ∈ (2nd ‘𝐶) ↔ (𝑟 ∈ Q ∧ ∃𝑦(𝑦 ∈ (1st ‘𝐴) ∧ (𝑦 +Q 𝑟) ∈ (2nd ‘𝐵))))
94	92, 93	sylibr 133	. . . . . . 7 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵) ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑟 ∈ (2nd ‘𝐶))
95	94	3expa 1198	. . . . . 6 ⊢ (((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) ∧ 𝑦 ∈ (1st ‘𝐴)) → 𝑟 ∈ (2nd ‘𝐶))
96	73, 95	exlimddv 1891	. . . . 5 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) → 𝑟 ∈ (2nd ‘𝐶))
97		19.8a 1583	. . . . 5 ⊢ ((𝑟 ∈ Q ∧ 𝑟 ∈ (2nd ‘𝐶)) → ∃𝑟(𝑟 ∈ Q ∧ 𝑟 ∈ (2nd ‘𝐶)))
98	68, 96, 97	syl2anc 409	. . . 4 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) → ∃𝑟(𝑟 ∈ Q ∧ 𝑟 ∈ (2nd ‘𝐶)))
99		df-rex 2454	. . . 4 ⊢ (∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐶) ↔ ∃𝑟(𝑟 ∈ Q ∧ 𝑟 ∈ (2nd ‘𝐶)))
100	98, 99	sylibr 133	. . 3 ⊢ ((𝐴<P 𝐵 ∧ 𝑟 ∈ (2nd ‘𝐵)) → ∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐶))
101	60, 61, 65, 100	exlimdd 1865	. 2 ⊢ (𝐴<P 𝐵 → ∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐶))
102	59, 101	jca 304	1 ⊢ (𝐴<P 𝐵 → (∃𝑞 ∈ Q 𝑞 ∈ (1st ‘𝐶) ∧ ∃𝑟 ∈ Q 𝑟 ∈ (2nd ‘𝐶)))

Syntax hints:   → wi 4   ∧ wa 103   ↔ wb 104   ∧ w3a 973   = wceq 1348  ∃wex 1485   ∈ wcel 2141  ∃wrex 2449  {crab 2452   ⊆ wss 3121  ⟨cop 3586   class class class wbr 3989  ‘cfv 5198  (class class class)co 5853  1^st c1st 6117  2^nd c2nd 6118  Qcnq 7242   +_Q cplq 7244   <_Q cltq 7247  Pcnp 7253  <_P cltp 7257

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572

This theorem depends on definitions:  df-bi 116  df-dc 830  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-eprel 4274  df-id 4278  df-iord 4351  df-on 4353  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-irdg 6349  df-1o 6395  df-oadd 6399  df-omul 6400  df-er 6513  df-ec 6515  df-qs 6519  df-ni 7266  df-pli 7267  df-mi 7268  df-lti 7269  df-plpq 7306  df-mpq 7307  df-enq 7309  df-nqqs 7310  df-plqqs 7311  df-mqqs 7312  df-1nqqs 7313  df-ltnqqs 7315  df-inp 7428  df-iltp 7432

This theorem is referenced by:  ltexprlempr  7570