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Theorem xrub 13291

Description: By quantifying only over reals, we can specify any extended real upper bound for any set of extended reals. (Contributed by NM, 9-Apr-2006.)

**Assertion**
Ref	Expression
xrub	⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ ∀𝑥 ∈ ℝ^ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))

Distinct variable groups: 𝑥,𝑦,𝐴 𝑥,𝐵,𝑦

Proof of Theorem xrub Dummy variable 𝑧 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		breq1 5152	. . . . . 6 ⊢ (𝑥 = 𝑧 → (𝑥 < 𝐵 ↔ 𝑧 < 𝐵))
2		breq1 5152	. . . . . . 7 ⊢ (𝑥 = 𝑧 → (𝑥 < 𝑦 ↔ 𝑧 < 𝑦))
3	2	rexbidv 3179	. . . . . 6 ⊢ (𝑥 = 𝑧 → (∃𝑦 ∈ 𝐴 𝑥 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 𝑧 < 𝑦))
4	1, 3	imbi12d 345	. . . . 5 ⊢ (𝑥 = 𝑧 → ((𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)))
5	4	cbvralvw 3235	. . . 4 ⊢ (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦))
6		elxr 13096	. . . . . . . 8 ⊢ (𝑥 ∈ ℝ^* ↔ (𝑥 ∈ ℝ ∨ 𝑥 = +∞ ∨ 𝑥 = -∞))
7		pm2.27 42	. . . . . . . . . 10 ⊢ (𝑥 ∈ ℝ → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
8	7	a1i 11	. . . . . . . . 9 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (𝑥 ∈ ℝ → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
9		pnfnlt 13108	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ^* → ¬ +∞ < 𝐵)
10		breq1 5152	. . . . . . . . . . . . . 14 ⊢ (𝑥 = +∞ → (𝑥 < 𝐵 ↔ +∞ < 𝐵))
11	10	notbid 318	. . . . . . . . . . . . 13 ⊢ (𝑥 = +∞ → (¬ 𝑥 < 𝐵 ↔ ¬ +∞ < 𝐵))
12	9, 11	imbitrrid 245	. . . . . . . . . . . 12 ⊢ (𝑥 = +∞ → (𝐵 ∈ ℝ^* → ¬ 𝑥 < 𝐵))
13		pm2.21 123	. . . . . . . . . . . 12 ⊢ (¬ 𝑥 < 𝐵 → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))
14	12, 13	syl6com 37	. . . . . . . . . . 11 ⊢ (𝐵 ∈ ℝ^* → (𝑥 = +∞ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
15	14	ad2antlr 726	. . . . . . . . . 10 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (𝑥 = +∞ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
16	15	a1dd 50	. . . . . . . . 9 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (𝑥 = +∞ → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
17		elxr 13096	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ^* ↔ (𝐵 ∈ ℝ ∨ 𝐵 = +∞ ∨ 𝐵 = -∞))
18		peano2rem 11527	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 ∈ ℝ → (𝐵 − 1) ∈ ℝ)
19		breq1 5152	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑧 = (𝐵 − 1) → (𝑧 < 𝐵 ↔ (𝐵 − 1) < 𝐵))
20		breq1 5152	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑧 = (𝐵 − 1) → (𝑧 < 𝑦 ↔ (𝐵 − 1) < 𝑦))
21	20	rexbidv 3179	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑧 = (𝐵 − 1) → (∃𝑦 ∈ 𝐴 𝑧 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
22	19, 21	imbi12d 345	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = (𝐵 − 1) → ((𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) ↔ ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
23	22	rspcv 3609	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐵 − 1) ∈ ℝ → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
24	18, 23	syl 17	. . . . . . . . . . . . . . . . 17 ⊢ (𝐵 ∈ ℝ → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
25	24	adantl 483	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
26		ltm1 12056	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 ∈ ℝ → (𝐵 − 1) < 𝐵)
27		id 22	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦) → ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
28	26, 27	syl5com 31	. . . . . . . . . . . . . . . . 17 ⊢ (𝐵 ∈ ℝ → (((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
29	28	adantl 483	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
30	18	ad2antlr 726	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → (𝐵 − 1) ∈ ℝ)
31		mnflt 13103	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐵 − 1) ∈ ℝ → -∞ < (𝐵 − 1))
32	30, 31	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → -∞ < (𝐵 − 1))
33		mnfxr 11271	. . . . . . . . . . . . . . . . . . 19 ⊢ -∞ ∈ ℝ^*
34	30	rexrd 11264	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → (𝐵 − 1) ∈ ℝ^*)
35		ssel2 3978	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ^*)
36	35	adantlr 714	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ^*)
37		xrlttr 13119	. . . . . . . . . . . . . . . . . . 19 ⊢ ((-∞ ∈ ℝ^* ∧ (𝐵 − 1) ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → ((-∞ < (𝐵 − 1) ∧ (𝐵 − 1) < 𝑦) → -∞ < 𝑦))
38	33, 34, 36, 37	mp3an2i 1467	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → ((-∞ < (𝐵 − 1) ∧ (𝐵 − 1) < 𝑦) → -∞ < 𝑦))
39	32, 38	mpand 694	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → ((𝐵 − 1) < 𝑦 → -∞ < 𝑦))
40	39	reximdva 3169	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
41	25, 29, 40	3syld 60	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
42	41	a1dd 50	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
43		1re 11214	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℝ
44		breq1 5152	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = 1 → (𝑧 < 𝐵 ↔ 1 < 𝐵))
45		breq1 5152	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑧 = 1 → (𝑧 < 𝑦 ↔ 1 < 𝑦))
46	45	rexbidv 3179	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = 1 → (∃𝑦 ∈ 𝐴 𝑧 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 1 < 𝑦))
47	44, 46	imbi12d 345	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑧 = 1 → ((𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) ↔ (1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦)))
48	47	rspcv 3609	. . . . . . . . . . . . . . . . 17 ⊢ (1 ∈ ℝ → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦)))
49	43, 48	ax-mp 5	. . . . . . . . . . . . . . . 16 ⊢ (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦))
50		ltpnf 13100	. . . . . . . . . . . . . . . . . . . 20 ⊢ (1 ∈ ℝ → 1 < +∞)
51	43, 50	ax-mp 5	. . . . . . . . . . . . . . . . . . 19 ⊢ 1 < +∞
52		breq2 5153	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝐵 = +∞ → (1 < 𝐵 ↔ 1 < +∞))
53	51, 52	mpbiri 258	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 = +∞ → 1 < 𝐵)
54		id 22	. . . . . . . . . . . . . . . . . 18 ⊢ ((1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦) → (1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦))
55	53, 54	syl5com 31	. . . . . . . . . . . . . . . . 17 ⊢ (𝐵 = +∞ → ((1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦) → ∃𝑦 ∈ 𝐴 1 < 𝑦))
56		mnflt 13103	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (1 ∈ ℝ → -∞ < 1)
57	43, 56	ax-mp 5	. . . . . . . . . . . . . . . . . . . 20 ⊢ -∞ < 1
58		rexr 11260	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (1 ∈ ℝ → 1 ∈ ℝ^*)
59	43, 58	ax-mp 5	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 1 ∈ ℝ^*
60		xrlttr 13119	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((-∞ ∈ ℝ^* ∧ 1 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → ((-∞ < 1 ∧ 1 < 𝑦) → -∞ < 𝑦))
61	33, 59, 60	mp3an12 1452	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 ∈ ℝ^* → ((-∞ < 1 ∧ 1 < 𝑦) → -∞ < 𝑦))
62	57, 61	mpani 695	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑦 ∈ ℝ^* → (1 < 𝑦 → -∞ < 𝑦))
63	35, 62	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝑦 ∈ 𝐴) → (1 < 𝑦 → -∞ < 𝑦))
64	63	reximdva 3169	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ⊆ ℝ^* → (∃𝑦 ∈ 𝐴 1 < 𝑦 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
65	55, 64	sylan9r 510	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 = +∞) → ((1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦) → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
66	49, 65	syl5 34	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 = +∞) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
67	66	a1dd 50	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 = +∞) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
68		xrltnr 13099	. . . . . . . . . . . . . . . . . . 19 ⊢ (-∞ ∈ ℝ^* → ¬ -∞ < -∞)
69	33, 68	ax-mp 5	. . . . . . . . . . . . . . . . . 18 ⊢ ¬ -∞ < -∞
70		breq2 5153	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 = -∞ → (-∞ < 𝐵 ↔ -∞ < -∞))
71	69, 70	mtbiri 327	. . . . . . . . . . . . . . . . 17 ⊢ (𝐵 = -∞ → ¬ -∞ < 𝐵)
72	71	adantl 483	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 = -∞) → ¬ -∞ < 𝐵)
73	72	pm2.21d 121	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 = -∞) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
74	73	a1d 25	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 = -∞) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
75	42, 67, 74	3jaodan 1431	. . . . . . . . . . . . 13 ⊢ ((𝐴 ⊆ ℝ^* ∧ (𝐵 ∈ ℝ ∨ 𝐵 = +∞ ∨ 𝐵 = -∞)) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
76	17, 75	sylan2b 595	. . . . . . . . . . . 12 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
77	76	imp 408	. . . . . . . . . . 11 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
78		breq1 5152	. . . . . . . . . . . 12 ⊢ (𝑥 = -∞ → (𝑥 < 𝐵 ↔ -∞ < 𝐵))
79		breq1 5152	. . . . . . . . . . . . 13 ⊢ (𝑥 = -∞ → (𝑥 < 𝑦 ↔ -∞ < 𝑦))
80	79	rexbidv 3179	. . . . . . . . . . . 12 ⊢ (𝑥 = -∞ → (∃𝑦 ∈ 𝐴 𝑥 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
81	78, 80	imbi12d 345	. . . . . . . . . . 11 ⊢ (𝑥 = -∞ → ((𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
82	77, 81	syl5ibrcom 246	. . . . . . . . . 10 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (𝑥 = -∞ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
83	82	a1dd 50	. . . . . . . . 9 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (𝑥 = -∞ → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
84	8, 16, 83	3jaod 1429	. . . . . . . 8 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → ((𝑥 ∈ ℝ ∨ 𝑥 = +∞ ∨ 𝑥 = -∞) → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
85	6, 84	biimtrid 241	. . . . . . 7 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (𝑥 ∈ ℝ^ → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
86	85	com23 86	. . . . . 6 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → ((𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 ∈ ℝ^ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
87	86	ralimdv2 3164	. . . . 5 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → ∀𝑥 ∈ ℝ^ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
88	87	ex 414	. . . 4 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → ∀𝑥 ∈ ℝ^ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
89	5, 88	biimtrid 241	. . 3 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → ∀𝑥 ∈ ℝ^ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))))
90	89	pm2.43d 53	. 2 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → ∀𝑥 ∈ ℝ^ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
91		rexr 11260	. . . 4 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℝ^*)
92	91	imim1i 63	. . 3 ⊢ ((𝑥 ∈ ℝ^* → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)) → (𝑥 ∈ ℝ → (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))
93	92	ralimi2 3079	. 2 ⊢ (∀𝑥 ∈ ℝ^* (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → ∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))
94	90, 93	impbid1 224	1 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^) → (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ ∀𝑥 ∈ ℝ^ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 397 ∨ w3o 1087 = wceq 1542 ∈ wcel 2107 ∀wral 3062 ∃wrex 3071 ⊆ wss 3949 class class class wbr 5149 (class class class)co 7409 ℝcr 11109 1c1 11111 +∞cpnf 11245 -∞cmnf 11246 ℝ^*cxr 11247 < clt 11248 − cmin 11444

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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-br 5150 df-opab 5212 df-mpt 5233 df-id 5575 df-po 5589 df-so 5590 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447

This theorem is referenced by: supxr 13292

W3C validator