infrpge - Mathbox for Glauco Siliprandi

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Theorem infrpge 46285

Description: The infimum of a nonempty, bounded subset of extended reals can be approximated from above by an element of the set. (Contributed by Glauco Siliprandi, 11-Oct-2020.)

**Hypotheses**
Ref	Expression
infrpge.xph	⊢ Ⅎ𝑥𝜑
infrpge.a	⊢ (𝜑 → 𝐴 ⊆ ℝ^*)
infrpge.an0	⊢ (𝜑 → 𝐴 ≠ ∅)
infrpge.bnd	⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)
infrpge.b	⊢ (𝜑 → 𝐵 ∈ ℝ⁺)

**Assertion**
Ref	Expression
infrpge	⊢ (𝜑 → ∃𝑧 ∈ 𝐴 𝑧 ≤ (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵))

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

**Proof of Theorem infrpge**
Step	Hyp	Ref	Expression
1		infrpge.an0	. . . . . 6 ⊢ (𝜑 → 𝐴 ≠ ∅)
2		n0 4299	. . . . . . 7 ⊢ (𝐴 ≠ ∅ ↔ ∃𝑧 𝑧 ∈ 𝐴)
3	2	biimpi 219	. . . . . 6 ⊢ (𝐴 ≠ ∅ → ∃𝑧 𝑧 ∈ 𝐴)
4	1, 3	syl 18	. . . . 5 ⊢ (𝜑 → ∃𝑧 𝑧 ∈ 𝐴)
5	4	adantr 486	. . . 4 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^*, < ) = +∞) → ∃𝑧 𝑧 ∈ 𝐴)
6		nfv 1947	. . . . 5 ⊢ Ⅎ𝑧(𝜑 ∧ inf(𝐴, ℝ^*, < ) = +∞)
7		simpr 490	. . . . . . 7 ⊢ (((𝜑 ∧ inf(𝐴, ℝ^*, < ) = +∞) ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ 𝐴)
8		infrpge.a	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐴 ⊆ ℝ^*)
9	8	adantr 486	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → 𝐴 ⊆ ℝ^*)
10		simpr 490	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ 𝐴)
11	9, 10	sseldd 3931	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → 𝑧 ∈ ℝ^*)
12		pnfge 13228	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ^* → 𝑧 ≤ +∞)
13	11, 12	syl 18	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → 𝑧 ≤ +∞)
14	13	adantlr 728	. . . . . . . 8 ⊢ (((𝜑 ∧ inf(𝐴, ℝ^*, < ) = +∞) ∧ 𝑧 ∈ 𝐴) → 𝑧 ≤ +∞)
15		oveq1 7415	. . . . . . . . . . 11 ⊢ (inf(𝐴, ℝ^, < ) = +∞ → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) = (+∞ +_𝑒 𝐵))
16	15	adantl 487	. . . . . . . . . 10 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) = (+∞ +_𝑒 𝐵))
17		infrpge.b	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ ℝ⁺)
18	17	rpxrd 13134	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
19	17	rpred 13133	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐵 ∈ ℝ)
20		renemnf 11329	. . . . . . . . . . . . 13 ⊢ (𝐵 ∈ ℝ → 𝐵 ≠ -∞)
21	19, 20	syl 18	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐵 ≠ -∞)
22		xaddpnf2 13326	. . . . . . . . . . . 12 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐵 ≠ -∞) → (+∞ +_𝑒 𝐵) = +∞)
23	18, 21, 22	syl2anc 596	. . . . . . . . . . 11 ⊢ (𝜑 → (+∞ +_𝑒 𝐵) = +∞)
24	23	adantr 486	. . . . . . . . . 10 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^*, < ) = +∞) → (+∞ +_𝑒 𝐵) = +∞)
25	16, 24	eqtr2d 2796	. . . . . . . . 9 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) → +∞ = (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
26	25	adantr 486	. . . . . . . 8 ⊢ (((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) ∧ 𝑧 ∈ 𝐴) → +∞ = (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
27	14, 26	breqtrd 5130	. . . . . . 7 ⊢ (((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) ∧ 𝑧 ∈ 𝐴) → 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
28	7, 27	jca 521	. . . . . 6 ⊢ (((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) ∧ 𝑧 ∈ 𝐴) → (𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵)))
29	28	ex 418	. . . . 5 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) → (𝑧 ∈ 𝐴 → (𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))))
30	6, 29	eximd 2252	. . . 4 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) → (∃𝑧 𝑧 ∈ 𝐴 → ∃𝑧(𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))))
31	5, 30	mpd 16	. . 3 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) → ∃𝑧(𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵)))
32		df-rex 3087	. . 3 ⊢ (∃𝑧 ∈ 𝐴 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ↔ ∃𝑧(𝑧 ∈ 𝐴 ∧ 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵)))
33	31, 32	sylibr 237	. 2 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) = +∞) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
34		simpl 488	. . . 4 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^*, < ) = +∞) → 𝜑)
35		infrpge.bnd	. . . . . . . . 9 ⊢ (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)
36		infrpge.xph	. . . . . . . . . 10 ⊢ Ⅎ𝑥𝜑
37		nfv 1947	. . . . . . . . . 10 ⊢ Ⅎ𝑥-∞ < inf(𝐴, ℝ^*, < )
38		mnfxr 11337	. . . . . . . . . . . . 13 ⊢ -∞ ∈ ℝ^*
39	38	a1i 11	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → -∞ ∈ ℝ^*)
40		rexr 11326	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℝ^*)
41	40	3ad2ant2 1152	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → 𝑥 ∈ ℝ^*)
42		infxrcl 13433	. . . . . . . . . . . . . 14 ⊢ (𝐴 ⊆ ℝ^* → inf(𝐴, ℝ^, < ) ∈ ℝ^)
43	8, 42	syl 18	. . . . . . . . . . . . 13 ⊢ (𝜑 → inf(𝐴, ℝ^, < ) ∈ ℝ^)
44	43	3ad2ant1 1151	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → inf(𝐴, ℝ^, < ) ∈ ℝ^)
45		mnflt 13221	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℝ → -∞ < 𝑥)
46	45	3ad2ant2 1152	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → -∞ < 𝑥)
47		simp3 1156	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦)
48	8	adantr 486	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → 𝐴 ⊆ ℝ^*)
49	40	adantl 487	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → 𝑥 ∈ ℝ^*)
50		infxrgelb 13435	. . . . . . . . . . . . . . 15 ⊢ ((𝐴 ⊆ ℝ^* ∧ 𝑥 ∈ ℝ^) → (𝑥 ≤ inf(𝐴, ℝ^, < ) ↔ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦))
51	48, 49, 50	syl2anc 596	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ) → (𝑥 ≤ inf(𝐴, ℝ^*, < ) ↔ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦))
52	51	3adant3 1150	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → (𝑥 ≤ inf(𝐴, ℝ^*, < ) ↔ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦))
53	47, 52	mpbird 260	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → 𝑥 ≤ inf(𝐴, ℝ^*, < ))
54	39, 41, 44, 46, 53	xrltletrd 13259	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑥 ∈ ℝ ∧ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦) → -∞ < inf(𝐴, ℝ^*, < ))
55	54	3exp 1137	. . . . . . . . . 10 ⊢ (𝜑 → (𝑥 ∈ ℝ → (∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦 → -∞ < inf(𝐴, ℝ^*, < ))))
56	36, 37, 55	rexlimd 3269	. . . . . . . . 9 ⊢ (𝜑 → (∃𝑥 ∈ ℝ ∀𝑦 ∈ 𝐴 𝑥 ≤ 𝑦 → -∞ < inf(𝐴, ℝ^*, < )))
57	35, 56	mpd 16	. . . . . . . 8 ⊢ (𝜑 → -∞ < inf(𝐴, ℝ^*, < ))
58	57	adantr 486	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → -∞ < inf(𝐴, ℝ^, < ))
59		neqne 2963	. . . . . . . . 9 ⊢ (¬ inf(𝐴, ℝ^, < ) = +∞ → inf(𝐴, ℝ^, < ) ≠ +∞)
60	59	adantl 487	. . . . . . . 8 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → inf(𝐴, ℝ^, < ) ≠ +∞)
61	43	adantr 486	. . . . . . . 8 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → inf(𝐴, ℝ^, < ) ∈ ℝ^*)
62	60, 61	nepnfltpnf 46276	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → inf(𝐴, ℝ^, < ) < +∞)
63	58, 62	jca 521	. . . . . 6 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → (-∞ < inf(𝐴, ℝ^, < ) ∧ inf(𝐴, ℝ^*, < ) < +∞))
64		xrrebnd 13267	. . . . . . . 8 ⊢ (inf(𝐴, ℝ^, < ) ∈ ℝ^ → (inf(𝐴, ℝ^, < ) ∈ ℝ ↔ (-∞ < inf(𝐴, ℝ^, < ) ∧ inf(𝐴, ℝ^*, < ) < +∞)))
65	43, 64	syl 18	. . . . . . 7 ⊢ (𝜑 → (inf(𝐴, ℝ^, < ) ∈ ℝ ↔ (-∞ < inf(𝐴, ℝ^, < ) ∧ inf(𝐴, ℝ^*, < ) < +∞)))
66	65	adantr 486	. . . . . 6 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → (inf(𝐴, ℝ^, < ) ∈ ℝ ↔ (-∞ < inf(𝐴, ℝ^, < ) ∧ inf(𝐴, ℝ^, < ) < +∞)))
67	63, 66	mpbird 260	. . . . 5 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → inf(𝐴, ℝ^, < ) ∈ ℝ)
68		simpr 490	. . . . . . . 8 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → inf(𝐴, ℝ^, < ) ∈ ℝ)
69	17	adantr 486	. . . . . . . 8 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^*, < ) ∈ ℝ) → 𝐵 ∈ ℝ⁺)
70	68, 69	ltaddrpd 13166	. . . . . . 7 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → inf(𝐴, ℝ^, < ) < (inf(𝐴, ℝ^*, < ) + 𝐵))
71	19	adantr 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^*, < ) ∈ ℝ) → 𝐵 ∈ ℝ)
72		rexadd 13331	. . . . . . . . 9 ⊢ ((inf(𝐴, ℝ^, < ) ∈ ℝ ∧ 𝐵 ∈ ℝ) → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) = (inf(𝐴, ℝ^*, < ) + 𝐵))
73	68, 71, 72	syl2anc 596	. . . . . . . 8 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) = (inf(𝐴, ℝ^*, < ) + 𝐵))
74	73	eqcomd 2766	. . . . . . 7 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → (inf(𝐴, ℝ^, < ) + 𝐵) = (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵))
75	70, 74	breqtrd 5130	. . . . . 6 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → inf(𝐴, ℝ^, < ) < (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵))
76	43	adantr 486	. . . . . . 7 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → inf(𝐴, ℝ^, < ) ∈ ℝ^*)
77	43, 18	xaddcld 13400	. . . . . . . 8 ⊢ (𝜑 → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ∈ ℝ^)
78	77	adantr 486	. . . . . . 7 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ∈ ℝ^*)
79		xrltnle 11347	. . . . . . 7 ⊢ ((inf(𝐴, ℝ^, < ) ∈ ℝ^ ∧ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ∈ ℝ^) → (inf(𝐴, ℝ^, < ) < (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ↔ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < )))
80	76, 78, 79	syl2anc 596	. . . . . 6 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → (inf(𝐴, ℝ^, < ) < (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ↔ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^*, < )))
81	75, 80	mpbid 235	. . . . 5 ⊢ ((𝜑 ∧ inf(𝐴, ℝ^, < ) ∈ ℝ) → ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^*, < ))
82	34, 67, 81	syl2anc 596	. . . 4 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^*, < ))
83		simpr 490	. . . . . 6 ⊢ ((𝜑 ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < )) → ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < ))
84		simpl 488	. . . . . . 7 ⊢ ((𝜑 ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < )) → 𝜑)
85		infxrgelb 13435	. . . . . . . 8 ⊢ ((𝐴 ⊆ ℝ^* ∧ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ∈ ℝ^) → ((inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < ) ↔ ∀𝑧 ∈ 𝐴 (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵) ≤ 𝑧))
86	8, 77, 85	syl2anc 596	. . . . . . 7 ⊢ (𝜑 → ((inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < ) ↔ ∀𝑧 ∈ 𝐴 (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵) ≤ 𝑧))
87	84, 86	syl 18	. . . . . 6 ⊢ ((𝜑 ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < )) → ((inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < ) ↔ ∀𝑧 ∈ 𝐴 (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵) ≤ 𝑧))
88	83, 87	mtbid 327	. . . . 5 ⊢ ((𝜑 ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < )) → ¬ ∀𝑧 ∈ 𝐴 (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵) ≤ 𝑧)
89		rexnal 3114	. . . . 5 ⊢ (∃𝑧 ∈ 𝐴 ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧 ↔ ¬ ∀𝑧 ∈ 𝐴 (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧)
90	88, 89	sylibr 237	. . . 4 ⊢ ((𝜑 ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ inf(𝐴, ℝ^, < )) → ∃𝑧 ∈ 𝐴 ¬ (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵) ≤ 𝑧)
91	34, 82, 90	syl2anc 596	. . 3 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → ∃𝑧 ∈ 𝐴 ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧)
92	11	adantr 486	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝐴) ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧) → 𝑧 ∈ ℝ^)
93	77	ad2antrr 739	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝐴) ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧) → (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ∈ ℝ^*)
94		simpr 490	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝐴) ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧) → ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧)
95		xrltnle 11347	. . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ^* ∧ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ∈ ℝ^) → (𝑧 < (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ↔ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧))
96	92, 93, 95	syl2anc 596	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝐴) ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧) → (𝑧 < (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ↔ ¬ (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵) ≤ 𝑧))
97	94, 96	mpbird 260	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝐴) ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧) → 𝑧 < (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
98	92, 93, 97	xrltled 13248	. . . . . 6 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝐴) ∧ ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧) → 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
99	98	ex 418	. . . . 5 ⊢ ((𝜑 ∧ 𝑧 ∈ 𝐴) → (¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧 → 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵)))
100	99	adantlr 728	. . . 4 ⊢ (((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) ∧ 𝑧 ∈ 𝐴) → (¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧 → 𝑧 ≤ (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵)))
101	100	reximdva 3175	. . 3 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → (∃𝑧 ∈ 𝐴 ¬ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵) ≤ 𝑧 → ∃𝑧 ∈ 𝐴 𝑧 ≤ (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵)))
102	91, 101	mpd 16	. 2 ⊢ ((𝜑 ∧ ¬ inf(𝐴, ℝ^, < ) = +∞) → ∃𝑧 ∈ 𝐴 𝑧 ≤ (inf(𝐴, ℝ^, < ) +_𝑒 𝐵))
103	33, 102	pm2.61dan 825	1 ⊢ (𝜑 → ∃𝑧 ∈ 𝐴 𝑧 ≤ (inf(𝐴, ℝ^*, < ) +_𝑒 𝐵))

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1570 ∃wex 1812 Ⅎwnf 1816 ∈ wcel 2145 ≠ wne 2955 ∀wral 3076 ∃wrex 3086 ⊆ wss 3898 ∅c0 4278 class class class wbr 5102 (class class class)co 7408 infcinf 9411 ℝcr 11170 + caddc 11174 +∞cpnf 11311 -∞cmnf 11312 ℝ^*cxr 11313 < clt 11314 ≤ cle 11315 ℝ⁺crp 13089 +_𝑒 cxad 13208

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 ax-cnex 11227 ax-resscn 11228 ax-1cn 11229 ax-icn 11230 ax-addcl 11231 ax-addrcl 11232 ax-mulcl 11233 ax-mulrcl 11234 ax-mulcom 11235 ax-addass 11236 ax-mulass 11237 ax-distr 11238 ax-i2m1 11239 ax-1ne0 11240 ax-1rid 11241 ax-rnegex 11242 ax-rrecex 11243 ax-cnre 11244 ax-pre-lttri 11245 ax-pre-lttrn 11246 ax-pre-ltadd 11247 ax-pre-mulgt0 11248 ax-pre-sup 11249

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 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 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5542 df-po 5555 df-so 5556 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-1st 7984 df-2nd 7985 df-er 8695 df-en 8952 df-dom 8953 df-sdom 8954 df-sup 9412 df-inf 9413 df-pnf 11316 df-mnf 11317 df-xr 11318 df-ltxr 11319 df-le 11320 df-sub 11514 df-neg 11515 df-rp 13090 df-xadd 13211

This theorem is used by: infleinf 46305 infrpgernmpt 46397 ovnlerp 47494

W3C validator