supxrgere - Mathbox for Glauco Siliprandi

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Theorem supxrgere 46453

Description: If a real number can be approximated from below by members of a set, then it is less than or equal to the supremum of the set. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

**Hypotheses**
Ref	Expression
supxrgere.xph	⊢ Ⅎ𝑥𝜑
supxrgere.a	⊢ (𝜑 → 𝐴 ⊆ ℝ^*)
supxrgere.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
supxrgere.y	⊢ ((𝜑 ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 𝑥) < 𝑦)

**Assertion**
Ref	Expression
supxrgere	⊢ (𝜑 → 𝐵 ≤ sup(𝐴, ℝ^*, < ))

Distinct variable groups: 𝑥,𝐴,𝑦 𝑥,𝐵,𝑦 𝜑,𝑦 Allowed substitution hint: 𝜑(𝑥)

**Proof of Theorem supxrgere**
Step	Hyp	Ref	Expression
1		supxrgere.b	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ)
2		rexr 11362	. . . . . 6 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℝ^*)
3		pnfxr 11370	. . . . . . 7 ⊢ +∞ ∈ ℝ^*
4	3	a1i 11	. . . . . 6 ⊢ (𝐵 ∈ ℝ → +∞ ∈ ℝ^*)
5		ltpnf 13256	. . . . . 6 ⊢ (𝐵 ∈ ℝ → 𝐵 < +∞)
6	2, 4, 5	xrltled 13286	. . . . 5 ⊢ (𝐵 ∈ ℝ → 𝐵 ≤ +∞)
7	1, 6	syl 18	. . . 4 ⊢ (𝜑 → 𝐵 ≤ +∞)
8	7	adantr 486	. . 3 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^*, < ) = +∞) → 𝐵 ≤ +∞)
9		id 23	. . . . 5 ⊢ (sup(𝐴, ℝ^, < ) = +∞ → sup(𝐴, ℝ^, < ) = +∞)
10	9	eqcomd 2766	. . . 4 ⊢ (sup(𝐴, ℝ^, < ) = +∞ → +∞ = sup(𝐴, ℝ^, < ))
11	10	adantl 487	. . 3 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^, < ) = +∞) → +∞ = sup(𝐴, ℝ^, < ))
12	8, 11	breqtrd 5130	. 2 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^, < ) = +∞) → 𝐵 ≤ sup(𝐴, ℝ^, < ))
13		simpl 488	. . 3 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^*, < ) = +∞) → 𝜑)
14		1rp 13131	. . . . . . . 8 ⊢ 1 ∈ ℝ⁺
15		nfcv 2922	. . . . . . . . . 10 ⊢ Ⅎ𝑥1
16		supxrgere.xph	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥𝜑
17		nfv 1946	. . . . . . . . . . . 12 ⊢ Ⅎ𝑥1 ∈ ℝ⁺
18	16, 17	nfan 1931	. . . . . . . . . . 11 ⊢ Ⅎ𝑥(𝜑 ∧ 1 ∈ ℝ⁺)
19		nfv 1946	. . . . . . . . . . 11 ⊢ Ⅎ𝑥∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦
20	18, 19	nfim 1928	. . . . . . . . . 10 ⊢ Ⅎ𝑥((𝜑 ∧ 1 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)
21		eleq1 2848	. . . . . . . . . . . 12 ⊢ (𝑥 = 1 → (𝑥 ∈ ℝ⁺ ↔ 1 ∈ ℝ⁺))
22	21	anbi2d 642	. . . . . . . . . . 11 ⊢ (𝑥 = 1 → ((𝜑 ∧ 𝑥 ∈ ℝ⁺) ↔ (𝜑 ∧ 1 ∈ ℝ⁺)))
23		oveq2 7432	. . . . . . . . . . . . 13 ⊢ (𝑥 = 1 → (𝐵 − 𝑥) = (𝐵 − 1))
24	23	breq1d 5112	. . . . . . . . . . . 12 ⊢ (𝑥 = 1 → ((𝐵 − 𝑥) < 𝑦 ↔ (𝐵 − 1) < 𝑦))
25	24	rexbidv 3186	. . . . . . . . . . 11 ⊢ (𝑥 = 1 → (∃𝑦 ∈ 𝐴 (𝐵 − 𝑥) < 𝑦 ↔ ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
26	22, 25	imbi12d 347	. . . . . . . . . 10 ⊢ (𝑥 = 1 → (((𝜑 ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 𝑥) < 𝑦) ↔ ((𝜑 ∧ 1 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)))
27		supxrgere.y	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 𝑥) < 𝑦)
28	15, 20, 26, 27	vtoclgf 3529	. . . . . . . . 9 ⊢ (1 ∈ ℝ⁺ → ((𝜑 ∧ 1 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦))
29	14, 28	ax-mp 5	. . . . . . . 8 ⊢ ((𝜑 ∧ 1 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)
30	14, 29	mpan2 704	. . . . . . 7 ⊢ (𝜑 → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)
31	30	adantr 486	. . . . . 6 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^*, < ) = +∞) → ∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦)
32		mnfxr 11373	. . . . . . . . . . 11 ⊢ -∞ ∈ ℝ^*
33	32	a1i 11	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) → -∞ ∈ ℝ^*)
34		supxrgere.a	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐴 ⊆ ℝ^*)
35	34	sselda 3909	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ ℝ^*)
36	35	3adant3 1150	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) → 𝑦 ∈ ℝ^*)
37		supxrcl 13452	. . . . . . . . . . . 12 ⊢ (𝐴 ⊆ ℝ^* → sup(𝐴, ℝ^, < ) ∈ ℝ^)
38	34, 37	syl 18	. . . . . . . . . . 11 ⊢ (𝜑 → sup(𝐴, ℝ^, < ) ∈ ℝ^)
39	38	3ad2ant1 1151	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) → sup(𝐴, ℝ^, < ) ∈ ℝ^)
40		peano2rem 11632	. . . . . . . . . . . . . . . 16 ⊢ (𝐵 ∈ ℝ → (𝐵 − 1) ∈ ℝ)
41	1, 40	syl 18	. . . . . . . . . . . . . . 15 ⊢ (𝜑 → (𝐵 − 1) ∈ ℝ)
42	41	rexrd 11366	. . . . . . . . . . . . . 14 ⊢ (𝜑 → (𝐵 − 1) ∈ ℝ^*)
43	42	adantr 486	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ ¬ -∞ < 𝑦) → (𝐵 − 1) ∈ ℝ^*)
44	43	3ad2antl1 1204	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → (𝐵 − 1) ∈ ℝ^*)
45	36	adantr 486	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → 𝑦 ∈ ℝ^*)
46	32	a1i 11	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → -∞ ∈ ℝ^*)
47		simpl3 1212	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → (𝐵 − 1) < 𝑦)
48		simpr 490	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴) ∧ ¬ -∞ < 𝑦) → ¬ -∞ < 𝑦)
49	35	adantr 486	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴) ∧ ¬ -∞ < 𝑦) → 𝑦 ∈ ℝ^*)
50	32	a1i 11	. . . . . . . . . . . . . . 15 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴) ∧ ¬ -∞ < 𝑦) → -∞ ∈ ℝ^*)
51		xrlenlt 11381	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℝ^* ∧ -∞ ∈ ℝ^*) → (𝑦 ≤ -∞ ↔ ¬ -∞ < 𝑦))
52	49, 50, 51	syl2anc 596	. . . . . . . . . . . . . 14 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴) ∧ ¬ -∞ < 𝑦) → (𝑦 ≤ -∞ ↔ ¬ -∞ < 𝑦))
53	48, 52	mpbird 260	. . . . . . . . . . . . 13 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴) ∧ ¬ -∞ < 𝑦) → 𝑦 ≤ -∞)
54	53	3adantl3 1187	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → 𝑦 ≤ -∞)
55	44, 45, 46, 47, 54	xrltletrd 13297	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → (𝐵 − 1) < -∞)
56		nltmnf 13265	. . . . . . . . . . . . . 14 ⊢ ((𝐵 − 1) ∈ ℝ^* → ¬ (𝐵 − 1) < -∞)
57	42, 56	syl 18	. . . . . . . . . . . . 13 ⊢ (𝜑 → ¬ (𝐵 − 1) < -∞)
58	57	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ ¬ -∞ < 𝑦) → ¬ (𝐵 − 1) < -∞)
59	58	3ad2antl1 1204	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) ∧ ¬ -∞ < 𝑦) → ¬ (𝐵 − 1) < -∞)
60	55, 59	condan 830	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) → -∞ < 𝑦)
61	34	adantr 486	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝐴 ⊆ ℝ^*)
62		simpr 490	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝑦 ∈ 𝐴)
63		supxrub 13461	. . . . . . . . . . . 12 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝑦 ∈ 𝐴) → 𝑦 ≤ sup(𝐴, ℝ^*, < ))
64	61, 62, 63	syl2anc 596	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → 𝑦 ≤ sup(𝐴, ℝ^*, < ))
65	64	3adant3 1150	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) → 𝑦 ≤ sup(𝐴, ℝ^*, < ))
66	33, 36, 39, 60, 65	xrltletrd 13297	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴 ∧ (𝐵 − 1) < 𝑦) → -∞ < sup(𝐴, ℝ^*, < ))
67	66	3exp 1137	. . . . . . . 8 ⊢ (𝜑 → (𝑦 ∈ 𝐴 → ((𝐵 − 1) < 𝑦 → -∞ < sup(𝐴, ℝ^*, < ))))
68	67	adantr 486	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → (𝑦 ∈ 𝐴 → ((𝐵 − 1) < 𝑦 → -∞ < sup(𝐴, ℝ^, < ))))
69	68	rexlimdv 3161	. . . . . 6 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → (∃𝑦 ∈ 𝐴 (𝐵 − 1) < 𝑦 → -∞ < sup(𝐴, ℝ^, < )))
70	31, 69	mpd 16	. . . . 5 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → -∞ < sup(𝐴, ℝ^, < ))
71		simpr 490	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → ¬ sup(𝐴, ℝ^, < ) = +∞)
72		nltpnft 13301	. . . . . . . . 9 ⊢ (sup(𝐴, ℝ^, < ) ∈ ℝ^ → (sup(𝐴, ℝ^, < ) = +∞ ↔ ¬ sup(𝐴, ℝ^, < ) < +∞))
73	38, 72	syl 18	. . . . . . . 8 ⊢ (𝜑 → (sup(𝐴, ℝ^, < ) = +∞ ↔ ¬ sup(𝐴, ℝ^, < ) < +∞))
74	73	adantr 486	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → (sup(𝐴, ℝ^, < ) = +∞ ↔ ¬ sup(𝐴, ℝ^*, < ) < +∞))
75	71, 74	mtbid 327	. . . . . 6 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → ¬ ¬ sup(𝐴, ℝ^, < ) < +∞)
76	75	notnotrd 134	. . . . 5 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → sup(𝐴, ℝ^, < ) < +∞)
77	70, 76	jca 521	. . . 4 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → (-∞ < sup(𝐴, ℝ^, < ) ∧ sup(𝐴, ℝ^*, < ) < +∞))
78	38	adantr 486	. . . . 5 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → sup(𝐴, ℝ^, < ) ∈ ℝ^*)
79		xrrebnd 13305	. . . . 5 ⊢ (sup(𝐴, ℝ^, < ) ∈ ℝ^ → (sup(𝐴, ℝ^, < ) ∈ ℝ ↔ (-∞ < sup(𝐴, ℝ^, < ) ∧ sup(𝐴, ℝ^*, < ) < +∞)))
80	78, 79	syl 18	. . . 4 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → (sup(𝐴, ℝ^, < ) ∈ ℝ ↔ (-∞ < sup(𝐴, ℝ^, < ) ∧ sup(𝐴, ℝ^, < ) < +∞)))
81	77, 80	mpbird 260	. . 3 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → sup(𝐴, ℝ^, < ) ∈ ℝ)
82		simpl 488	. . . . 5 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → (𝜑 ∧ sup(𝐴, ℝ^*, < ) ∈ ℝ))
83		simpr 490	. . . . . 6 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → ¬ 𝐵 ≤ sup(𝐴, ℝ^*, < ))
84	82	simprd 501	. . . . . . 7 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → sup(𝐴, ℝ^*, < ) ∈ ℝ)
85	1	ad2antrr 739	. . . . . . 7 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → 𝐵 ∈ ℝ)
86	84, 85	ltnled 11464	. . . . . 6 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → (sup(𝐴, ℝ^, < ) < 𝐵 ↔ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )))
87	83, 86	mpbird 260	. . . . 5 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → sup(𝐴, ℝ^*, < ) < 𝐵)
88		simpll 779	. . . . . . 7 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → 𝜑)
89	1	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^*, < ) ∈ ℝ) → 𝐵 ∈ ℝ)
90		simpr 490	. . . . . . . . . 10 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) → sup(𝐴, ℝ^, < ) ∈ ℝ)
91	89, 90	resubcld 11751	. . . . . . . . 9 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) → (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ)
92	91	adantr 486	. . . . . . . 8 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → (𝐵 − sup(𝐴, ℝ^*, < )) ∈ ℝ)
93		simpr 490	. . . . . . . . 9 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → sup(𝐴, ℝ^*, < ) < 𝐵)
94	90	adantr 486	. . . . . . . . . 10 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → sup(𝐴, ℝ^*, < ) ∈ ℝ)
95	88, 1	syl 18	. . . . . . . . . 10 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → 𝐵 ∈ ℝ)
96	94, 95	posdifd 11910	. . . . . . . . 9 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → (sup(𝐴, ℝ^, < ) < 𝐵 ↔ 0 < (𝐵 − sup(𝐴, ℝ^, < ))))
97	93, 96	mpbid 235	. . . . . . . 8 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → 0 < (𝐵 − sup(𝐴, ℝ^*, < )))
98	92, 97	elrpd 13168	. . . . . . 7 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → (𝐵 − sup(𝐴, ℝ^*, < )) ∈ ℝ⁺)
99		ovex 7457	. . . . . . . 8 ⊢ (𝐵 − sup(𝐴, ℝ^*, < )) ∈ V
100		nfcv 2922	. . . . . . . . 9 ⊢ Ⅎ𝑥(𝐵 − sup(𝐴, ℝ^*, < ))
101		nfv 1946	. . . . . . . . . . 11 ⊢ Ⅎ𝑥(𝐵 − sup(𝐴, ℝ^*, < )) ∈ ℝ⁺
102	16, 101	nfan 1931	. . . . . . . . . 10 ⊢ Ⅎ𝑥(𝜑 ∧ (𝐵 − sup(𝐴, ℝ^*, < )) ∈ ℝ⁺)
103		nfv 1946	. . . . . . . . . 10 ⊢ Ⅎ𝑥∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^*, < ))) < 𝑦
104	102, 103	nfim 1928	. . . . . . . . 9 ⊢ Ⅎ𝑥((𝜑 ∧ (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦)
105		eleq1 2848	. . . . . . . . . . 11 ⊢ (𝑥 = (𝐵 − sup(𝐴, ℝ^, < )) → (𝑥 ∈ ℝ⁺ ↔ (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ⁺))
106	105	anbi2d 642	. . . . . . . . . 10 ⊢ (𝑥 = (𝐵 − sup(𝐴, ℝ^, < )) → ((𝜑 ∧ 𝑥 ∈ ℝ⁺) ↔ (𝜑 ∧ (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ⁺)))
107		oveq2 7432	. . . . . . . . . . . 12 ⊢ (𝑥 = (𝐵 − sup(𝐴, ℝ^, < )) → (𝐵 − 𝑥) = (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))))
108	107	breq1d 5112	. . . . . . . . . . 11 ⊢ (𝑥 = (𝐵 − sup(𝐴, ℝ^, < )) → ((𝐵 − 𝑥) < 𝑦 ↔ (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦))
109	108	rexbidv 3186	. . . . . . . . . 10 ⊢ (𝑥 = (𝐵 − sup(𝐴, ℝ^, < )) → (∃𝑦 ∈ 𝐴 (𝐵 − 𝑥) < 𝑦 ↔ ∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦))
110	106, 109	imbi12d 347	. . . . . . . . 9 ⊢ (𝑥 = (𝐵 − sup(𝐴, ℝ^, < )) → (((𝜑 ∧ 𝑥 ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − 𝑥) < 𝑦) ↔ ((𝜑 ∧ (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^*, < ))) < 𝑦)))
111	100, 104, 110, 27	vtoclgf 3529	. . . . . . . 8 ⊢ ((𝐵 − sup(𝐴, ℝ^, < )) ∈ V → ((𝜑 ∧ (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^*, < ))) < 𝑦))
112	99, 111	ax-mp 5	. . . . . . 7 ⊢ ((𝜑 ∧ (𝐵 − sup(𝐴, ℝ^, < )) ∈ ℝ⁺) → ∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦)
113	88, 98, 112	syl2anc 596	. . . . . 6 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → ∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^*, < ))) < 𝑦)
114	1	recnd 11344	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ ℂ)
115	114	ad3antrrr 743	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ (𝐵 − (𝐵 − sup(𝐴, ℝ^*, < ))) < 𝑦) → 𝐵 ∈ ℂ)
116	90	recnd 11344	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) → sup(𝐴, ℝ^, < ) ∈ ℂ)
117	116	ad2antrr 739	. . . . . . . . . . . 12 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦) → sup(𝐴, ℝ^, < ) ∈ ℂ)
118	115, 117	nncand 11681	. . . . . . . . . . 11 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦) → (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) = sup(𝐴, ℝ^*, < ))
119	118	eqcomd 2766	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦) → sup(𝐴, ℝ^, < ) = (𝐵 − (𝐵 − sup(𝐴, ℝ^*, < ))))
120		simpr 490	. . . . . . . . . 10 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦) → (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦)
121	119, 120	eqbrtrd 5126	. . . . . . . . 9 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦) → sup(𝐴, ℝ^, < ) < 𝑦)
122	121	ex 418	. . . . . . . 8 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → ((𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦 → sup(𝐴, ℝ^, < ) < 𝑦))
123	122	adantr 486	. . . . . . 7 ⊢ ((((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) ∧ 𝑦 ∈ 𝐴) → ((𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦 → sup(𝐴, ℝ^, < ) < 𝑦))
124	123	reximdva 3175	. . . . . 6 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → (∃𝑦 ∈ 𝐴 (𝐵 − (𝐵 − sup(𝐴, ℝ^, < ))) < 𝑦 → ∃𝑦 ∈ 𝐴 sup(𝐴, ℝ^, < ) < 𝑦))
125	113, 124	mpd 16	. . . . 5 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ sup(𝐴, ℝ^, < ) < 𝐵) → ∃𝑦 ∈ 𝐴 sup(𝐴, ℝ^*, < ) < 𝑦)
126	82, 87, 125	syl2anc 596	. . . 4 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → ∃𝑦 ∈ 𝐴 sup(𝐴, ℝ^*, < ) < 𝑦)
127	61, 37	syl 18	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → sup(𝐴, ℝ^, < ) ∈ ℝ^)
128	35, 127	xrlenltd 11382	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → (𝑦 ≤ sup(𝐴, ℝ^, < ) ↔ ¬ sup(𝐴, ℝ^, < ) < 𝑦))
129	64, 128	mpbid 235	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐴) → ¬ sup(𝐴, ℝ^*, < ) < 𝑦)
130	129	ralrimiva 3154	. . . . . 6 ⊢ (𝜑 → ∀𝑦 ∈ 𝐴 ¬ sup(𝐴, ℝ^*, < ) < 𝑦)
131		ralnex 3088	. . . . . 6 ⊢ (∀𝑦 ∈ 𝐴 ¬ sup(𝐴, ℝ^, < ) < 𝑦 ↔ ¬ ∃𝑦 ∈ 𝐴 sup(𝐴, ℝ^, < ) < 𝑦)
132	130, 131	sylib 221	. . . . 5 ⊢ (𝜑 → ¬ ∃𝑦 ∈ 𝐴 sup(𝐴, ℝ^*, < ) < 𝑦)
133	132	ad2antrr 739	. . . 4 ⊢ (((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) ∧ ¬ 𝐵 ≤ sup(𝐴, ℝ^, < )) → ¬ ∃𝑦 ∈ 𝐴 sup(𝐴, ℝ^*, < ) < 𝑦)
134	126, 133	condan 830	. . 3 ⊢ ((𝜑 ∧ sup(𝐴, ℝ^, < ) ∈ ℝ) → 𝐵 ≤ sup(𝐴, ℝ^, < ))
135	13, 81, 134	syl2anc 596	. 2 ⊢ ((𝜑 ∧ ¬ sup(𝐴, ℝ^, < ) = +∞) → 𝐵 ≤ sup(𝐴, ℝ^, < ))
136	12, 135	pm2.61dan 825	1 ⊢ (𝜑 → 𝐵 ≤ sup(𝐴, ℝ^*, < ))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1569 Ⅎwnf 1815 ∈ wcel 2144 ∀wral 3076 ∃wrex 3086 Vcvv 3450 ⊆ wss 3896 class class class wbr 5102 (class class class)co 7424 supcsup 9439 ℂcc 11205 ℝcr 11206 0cc0 11207 1c1 11208 +∞cpnf 11347 -∞cmnf 11348 ℝ^*cxr 11349 < clt 11350 ≤ cle 11351 − cmin 11548 ℝ⁺crp 13127

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 ax-pr 5391 ax-un 7755 ax-cnex 11263 ax-resscn 11264 ax-1cn 11265 ax-icn 11266 ax-addcl 11267 ax-addrcl 11268 ax-mulcl 11269 ax-mulrcl 11270 ax-mulcom 11271 ax-addass 11272 ax-mulass 11273 ax-distr 11274 ax-i2m1 11275 ax-1ne0 11276 ax-1rid 11277 ax-rnegex 11278 ax-rrecex 11279 ax-cnre 11280 ax-pre-lttri 11281 ax-pre-lttrn 11282 ax-pre-ltadd 11283 ax-pre-mulgt0 11284 ax-pre-sup 11285

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5546 df-po 5559 df-so 5560 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7381 df-ov 7427 df-oprab 7428 df-mpo 7429 df-er 8724 df-en 8981 df-dom 8982 df-sdom 8983 df-sup 9441 df-pnf 11352 df-mnf 11353 df-xr 11354 df-ltxr 11355 df-le 11356 df-sub 11550 df-neg 11551 df-rp 13128

This theorem is used by: suplesup 46459

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