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Theorem xrub 13227

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 5101	. . . . . 6 ⊢ (𝑥 = 𝑧 → (𝑥 < 𝐵 ↔ 𝑧 < 𝐵))
2		breq1 5101	. . . . . . 7 ⊢ (𝑥 = 𝑧 → (𝑥 < 𝑦 ↔ 𝑧 < 𝑦))
3	2	rexbidv 3160	. . . . . 6 ⊢ (𝑥 = 𝑧 → (∃𝑦 ∈ 𝐴 𝑥 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 𝑧 < 𝑦))
4	1, 3	imbi12d 344	. . . . 5 ⊢ (𝑥 = 𝑧 → ((𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)))
5	4	cbvralvw 3214	. . . 4 ⊢ (∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦))
6		elxr 13030	. . . . . . . 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 13042	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ^* → ¬ +∞ < 𝐵)
10		breq1 5101	. . . . . . . . . . . . . 14 ⊢ (𝑥 = +∞ → (𝑥 < 𝐵 ↔ +∞ < 𝐵))
11	10	notbid 318	. . . . . . . . . . . . 13 ⊢ (𝑥 = +∞ → (¬ 𝑥 < 𝐵 ↔ ¬ +∞ < 𝐵))
12	9, 11	imbitrrid 246	. . . . . . . . . . . 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 727	. . . . . . . . . 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 13030	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ^* ↔ (𝐵 ∈ ℝ ∨ 𝐵 = +∞ ∨ 𝐵 = -∞))
18		peano2rem 11448	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 ∈ ℝ → (𝐵 − 1) ∈ ℝ)
19		breq1 5101	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑧 = (𝐵 − 1) → (𝑧 < 𝐵 ↔ (𝐵 − 1) < 𝐵))
20		breq1 5101	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑧 = (𝐵 − 1) → (𝑧 < 𝑦 ↔ (𝐵 − 1) < 𝑦))
21	20	rexbidv 3160	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑧 = (𝐵 − 1) → (∃𝑦 ∈ 𝐴 𝑧 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
22	19, 21	imbi12d 344	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = (𝐵 − 1) → ((𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) ↔ ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
23	22	rspcv 3572	. . . . . . . . . . . . . . . . . 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 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → ((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
26		ltm1 11983	. . . . . . . . . . . . . . . . . 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 481	. . . . . . . . . . . . . . . 16 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) → (((𝐵 − 1) < 𝐵 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
30	18	ad2antlr 727	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → (𝐵 − 1) ∈ ℝ)
31		mnflt 13037	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝐵 − 1) ∈ ℝ → -∞ < (𝐵 − 1))
32	30, 31	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → -∞ < (𝐵 − 1))
33		mnfxr 11189	. . . . . . . . . . . . . . . . . . 19 ⊢ -∞ ∈ ℝ^*
34	30	rexrd 11182	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → (𝐵 − 1) ∈ ℝ^*)
35		ssel2 3928	. . . . . . . . . . . . . . . . . . . 20 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ^*)
36	35	adantlr 715	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ^*)
37		xrlttr 13054	. . . . . . . . . . . . . . . . . . 19 ⊢ ((-∞ ∈ ℝ^* ∧ (𝐵 − 1) ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → ((-∞ < (𝐵 − 1) ∧ (𝐵 − 1) < 𝑦) → -∞ < 𝑦))
38	33, 34, 36, 37	mp3an2i 1468	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → ((-∞ < (𝐵 − 1) ∧ (𝐵 − 1) < 𝑦) → -∞ < 𝑦))
39	32, 38	mpand 695	. . . . . . . . . . . . . . . . 17 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ) ∧ 𝑦 ∈ 𝐴) → ((𝐵 − 1) < 𝑦 → -∞ < 𝑦))
40	39	reximdva 3149	. . . . . . . . . . . . . . . 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 11132	. . . . . . . . . . . . . . . . 17 ⊢ 1 ∈ ℝ
44		breq1 5101	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = 1 → (𝑧 < 𝐵 ↔ 1 < 𝐵))
45		breq1 5101	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑧 = 1 → (𝑧 < 𝑦 ↔ 1 < 𝑦))
46	45	rexbidv 3160	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 = 1 → (∃𝑦 ∈ 𝐴 𝑧 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 1 < 𝑦))
47	44, 46	imbi12d 344	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑧 = 1 → ((𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) ↔ (1 < 𝐵 → ∃𝑦 ∈ 𝐴 1 < 𝑦)))
48	47	rspcv 3572	. . . . . . . . . . . . . . . . 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 13034	. . . . . . . . . . . . . . . . . . . 20 ⊢ (1 ∈ ℝ → 1 < +∞)
51	43, 50	ax-mp 5	. . . . . . . . . . . . . . . . . . 19 ⊢ 1 < +∞
52		breq2 5102	. . . . . . . . . . . . . . . . . . 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 13037	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (1 ∈ ℝ → -∞ < 1)
57	43, 56	ax-mp 5	. . . . . . . . . . . . . . . . . . . 20 ⊢ -∞ < 1
58		rexr 11178	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (1 ∈ ℝ → 1 ∈ ℝ^*)
59	43, 58	ax-mp 5	. . . . . . . . . . . . . . . . . . . . 21 ⊢ 1 ∈ ℝ^*
60		xrlttr 13054	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((-∞ ∈ ℝ^* ∧ 1 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → ((-∞ < 1 ∧ 1 < 𝑦) → -∞ < 𝑦))
61	33, 59, 60	mp3an12 1453	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 ∈ ℝ^* → ((-∞ < 1 ∧ 1 < 𝑦) → -∞ < 𝑦))
62	57, 61	mpani 696	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑦 ∈ ℝ^* → (1 < 𝑦 → -∞ < 𝑦))
63	35, 62	syl 17	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝑦 ∈ 𝐴) → (1 < 𝑦 → -∞ < 𝑦))
64	63	reximdva 3149	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ⊆ ℝ^* → (∃𝑦 ∈ 𝐴 1 < 𝑦 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
65	55, 64	sylan9r 508	. . . . . . . . . . . . . . . 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 13033	. . . . . . . . . . . . . . . . . . 19 ⊢ (-∞ ∈ ℝ^* → ¬ -∞ < -∞)
69	33, 68	ax-mp 5	. . . . . . . . . . . . . . . . . 18 ⊢ ¬ -∞ < -∞
70		breq2 5102	. . . . . . . . . . . . . . . . . 18 ⊢ (𝐵 = -∞ → (-∞ < 𝐵 ↔ -∞ < -∞))
71	69, 70	mtbiri 327	. . . . . . . . . . . . . . . . 17 ⊢ (𝐵 = -∞ → ¬ -∞ < 𝐵)
72	71	adantl 481	. . . . . . . . . . . . . . . 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 1433	. . . . . . . . . . . . 13 ⊢ ((𝐴 ⊆ ℝ^* ∧ (𝐵 ∈ ℝ ∨ 𝐵 = +∞ ∨ 𝐵 = -∞)) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
76	17, 75	sylan2b 594	. . . . . . . . . . . 12 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
77	76	imp 406	. . . . . . . . . . 11 ⊢ (((𝐴 ⊆ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ ∀𝑧 ∈ ℝ (𝑧 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑧 < 𝑦)) → (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
78		breq1 5101	. . . . . . . . . . . 12 ⊢ (𝑥 = -∞ → (𝑥 < 𝐵 ↔ -∞ < 𝐵))
79		breq1 5101	. . . . . . . . . . . . 13 ⊢ (𝑥 = -∞ → (𝑥 < 𝑦 ↔ -∞ < 𝑦))
80	79	rexbidv 3160	. . . . . . . . . . . 12 ⊢ (𝑥 = -∞ → (∃𝑦 ∈ 𝐴 𝑥 < 𝑦 ↔ ∃𝑦 ∈ 𝐴 -∞ < 𝑦))
81	78, 80	imbi12d 344	. . . . . . . . . . 11 ⊢ (𝑥 = -∞ → ((𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) ↔ (-∞ < 𝐵 → ∃𝑦 ∈ 𝐴 -∞ < 𝑦)))
82	77, 81	syl5ibrcom 247	. . . . . . . . . 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 1431	. . . . . . . 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 242	. . . . . . 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 3145	. . . . 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 412	. . . 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 242	. . 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 11178	. . . 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 3068	. 2 ⊢ (∀𝑥 ∈ ℝ^* (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦) → ∀𝑥 ∈ ℝ (𝑥 < 𝐵 → ∃𝑦 ∈ 𝐴 𝑥 < 𝑦))
94	90, 93	impbid1 225	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 206 ∧ wa 395 ∨ w3o 1085 = wceq 1541 ∈ wcel 2113 ∀wral 3051 ∃wrex 3060 ⊆ wss 3901 class class class wbr 5098 (class class class)co 7358 ℝcr 11025 1c1 11027 +∞cpnf 11163 -∞cmnf 11164 ℝ^*cxr 11165 < clt 11166 − cmin 11364

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-cnex 11082 ax-resscn 11083 ax-1cn 11084 ax-icn 11085 ax-addcl 11086 ax-addrcl 11087 ax-mulcl 11088 ax-mulrcl 11089 ax-mulcom 11090 ax-addass 11091 ax-mulass 11092 ax-distr 11093 ax-i2m1 11094 ax-1ne0 11095 ax-1rid 11096 ax-rnegex 11097 ax-rrecex 11098 ax-cnre 11099 ax-pre-lttri 11100 ax-pre-lttrn 11101 ax-pre-ltadd 11102 ax-pre-mulgt0 11103

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-po 5532 df-so 5533 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7315 df-ov 7361 df-oprab 7362 df-mpo 7363 df-er 8635 df-en 8884 df-dom 8885 df-sdom 8886 df-pnf 11168 df-mnf 11169 df-xr 11170 df-ltxr 11171 df-le 11172 df-sub 11366 df-neg 11367

This theorem is referenced by: supxr 13228

W3C validator