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Theorem ixxlb 13030

Description: Extract the lower bound of an interval. (Contributed by Mario Carneiro, 17-Jun-2014.) (Revised by AV, 12-Sep-2020.)

**Hypotheses**
Ref	Expression
ixx.1	⊢ 𝑂 = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥𝑅𝑧 ∧ 𝑧𝑆𝑦)})
ixxub.2	⊢ ((𝑤 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝑤 < 𝐵 → 𝑤𝑆𝐵))
ixxub.3	⊢ ((𝑤 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝑤𝑆𝐵 → 𝑤 ≤ 𝐵))
ixxub.4	⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴 < 𝑤 → 𝐴𝑅𝑤))
ixxub.5	⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴𝑅𝑤 → 𝐴 ≤ 𝑤))

**Assertion**
Ref	Expression
ixxlb	⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → inf((𝐴𝑂𝐵), ℝ^*, < ) = 𝐴)

Distinct variable groups: 𝑥,𝑤,𝑦,𝑧,𝐴 𝑤,𝑂 𝑤,𝐵,𝑥,𝑦,𝑧 𝑥,𝑅,𝑦,𝑧 𝑥,𝑆,𝑦,𝑧 Allowed substitution hints: 𝑅(𝑤) 𝑆(𝑤) 𝑂(𝑥,𝑦,𝑧)

**Proof of Theorem ixxlb**
Step	Hyp	Ref	Expression
1		ixx.1	. . . . . . . . 9 ⊢ 𝑂 = (𝑥 ∈ ℝ^, 𝑦 ∈ ℝ^ ↦ {𝑧 ∈ ℝ^* ∣ (𝑥𝑅𝑧 ∧ 𝑧𝑆𝑦)})
2	1	elixx1 13017	. . . . . . . 8 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^) → (𝑤 ∈ (𝐴𝑂𝐵) ↔ (𝑤 ∈ ℝ^ ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵)))
3	2	3adant3 1130	. . . . . . 7 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → (𝑤 ∈ (𝐴𝑂𝐵) ↔ (𝑤 ∈ ℝ^* ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵)))
4	3	biimpa 476	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → (𝑤 ∈ ℝ^* ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵))
5	4	simp1d 1140	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝑤 ∈ ℝ^*)
6	5	ex 412	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → (𝑤 ∈ (𝐴𝑂𝐵) → 𝑤 ∈ ℝ^*))
7	6	ssrdv 3923	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → (𝐴𝑂𝐵) ⊆ ℝ^*)
8		infxrcl 12996	. . 3 ⊢ ((𝐴𝑂𝐵) ⊆ ℝ^* → inf((𝐴𝑂𝐵), ℝ^, < ) ∈ ℝ^)
9	7, 8	syl 17	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → inf((𝐴𝑂𝐵), ℝ^, < ) ∈ ℝ^)
10		simp1 1134	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → 𝐴 ∈ ℝ^*)
11		simprr 769	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))
12	7	ad2antrr 722	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → (𝐴𝑂𝐵) ⊆ ℝ^)
13		qre 12622	. . . . . . . . . . 11 ⊢ (𝑤 ∈ ℚ → 𝑤 ∈ ℝ)
14	13	rexrd 10956	. . . . . . . . . 10 ⊢ (𝑤 ∈ ℚ → 𝑤 ∈ ℝ^*)
15	14	ad2antlr 723	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → 𝑤 ∈ ℝ^)
16		simprl 767	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → 𝐴 < 𝑤)
17	10	ad2antrr 722	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → 𝐴 ∈ ℝ^)
18		ixxub.4	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴 < 𝑤 → 𝐴𝑅𝑤))
19	17, 15, 18	syl2anc 583	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → (𝐴 < 𝑤 → 𝐴𝑅𝑤))
20	16, 19	mpd 15	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → 𝐴𝑅𝑤)
21	9	ad2antrr 722	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → inf((𝐴𝑂𝐵), ℝ^, < ) ∈ ℝ^*)
22		simpll2 1211	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → 𝐵 ∈ ℝ^)
23		simp3 1136	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → (𝐴𝑂𝐵) ≠ ∅)
24		n0 4277	. . . . . . . . . . . . . 14 ⊢ ((𝐴𝑂𝐵) ≠ ∅ ↔ ∃𝑤 𝑤 ∈ (𝐴𝑂𝐵))
25	23, 24	sylib 217	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → ∃𝑤 𝑤 ∈ (𝐴𝑂𝐵))
26	9	adantr 480	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → inf((𝐴𝑂𝐵), ℝ^, < ) ∈ ℝ^)
27		simpl2 1190	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝐵 ∈ ℝ^*)
28		infxrlb 12997	. . . . . . . . . . . . . . 15 ⊢ (((𝐴𝑂𝐵) ⊆ ℝ^* ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → inf((𝐴𝑂𝐵), ℝ^*, < ) ≤ 𝑤)
29	7, 28	sylan 579	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → inf((𝐴𝑂𝐵), ℝ^*, < ) ≤ 𝑤)
30	4	simp3d 1142	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝑤𝑆𝐵)
31		ixxub.3	. . . . . . . . . . . . . . . 16 ⊢ ((𝑤 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝑤𝑆𝐵 → 𝑤 ≤ 𝐵))
32	5, 27, 31	syl2anc 583	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → (𝑤𝑆𝐵 → 𝑤 ≤ 𝐵))
33	30, 32	mpd 15	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝑤 ≤ 𝐵)
34	26, 5, 27, 29, 33	xrletrd 12825	. . . . . . . . . . . . 13 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → inf((𝐴𝑂𝐵), ℝ^*, < ) ≤ 𝐵)
35	25, 34	exlimddv 1939	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → inf((𝐴𝑂𝐵), ℝ^*, < ) ≤ 𝐵)
36	35	ad2antrr 722	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → inf((𝐴𝑂𝐵), ℝ^, < ) ≤ 𝐵)
37	15, 21, 22, 11, 36	xrltletrd 12824	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → 𝑤 < 𝐵)
38		ixxub.2	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝑤 < 𝐵 → 𝑤𝑆𝐵))
39	15, 22, 38	syl2anc 583	. . . . . . . . . 10 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → (𝑤 < 𝐵 → 𝑤𝑆𝐵))
40	37, 39	mpd 15	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → 𝑤𝑆𝐵)
41	3	ad2antrr 722	. . . . . . . . 9 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → (𝑤 ∈ (𝐴𝑂𝐵) ↔ (𝑤 ∈ ℝ^ ∧ 𝐴𝑅𝑤 ∧ 𝑤𝑆𝐵)))
42	15, 20, 40, 41	mpbir3and 1340	. . . . . . . 8 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < ))) → 𝑤 ∈ (𝐴𝑂𝐵))
43	12, 42, 28	syl2anc 583	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → inf((𝐴𝑂𝐵), ℝ^, < ) ≤ 𝑤)
44	21, 15	xrlenltd 10972	. . . . . . 7 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → (inf((𝐴𝑂𝐵), ℝ^, < ) ≤ 𝑤 ↔ ¬ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < )))
45	43, 44	mpbid 231	. . . . . 6 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) ∧ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))) → ¬ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))
46	11, 45	pm2.65da 813	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ ℚ) → ¬ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < )))
47	46	nrexdv 3197	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → ¬ ∃𝑤 ∈ ℚ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^*, < )))
48		qbtwnxr 12863	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ inf((𝐴𝑂𝐵), ℝ^, < ) ∈ ℝ^ ∧ 𝐴 < inf((𝐴𝑂𝐵), ℝ^, < )) → ∃𝑤 ∈ ℚ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < )))
49	48	3expia 1119	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ inf((𝐴𝑂𝐵), ℝ^, < ) ∈ ℝ^) → (𝐴 < inf((𝐴𝑂𝐵), ℝ^, < ) → ∃𝑤 ∈ ℚ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))))
50	10, 9, 49	syl2anc 583	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → (𝐴 < inf((𝐴𝑂𝐵), ℝ^, < ) → ∃𝑤 ∈ ℚ (𝐴 < 𝑤 ∧ 𝑤 < inf((𝐴𝑂𝐵), ℝ^, < ))))
51	47, 50	mtod 197	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → ¬ 𝐴 < inf((𝐴𝑂𝐵), ℝ^*, < ))
52	9, 10, 51	xrnltled 10974	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → inf((𝐴𝑂𝐵), ℝ^*, < ) ≤ 𝐴)
53	4	simp2d 1141	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝐴𝑅𝑤)
54	10	adantr 480	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝐴 ∈ ℝ^*)
55		ixxub.5	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝑤 ∈ ℝ^*) → (𝐴𝑅𝑤 → 𝐴 ≤ 𝑤))
56	54, 5, 55	syl2anc 583	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → (𝐴𝑅𝑤 → 𝐴 ≤ 𝑤))
57	53, 56	mpd 15	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) ∧ 𝑤 ∈ (𝐴𝑂𝐵)) → 𝐴 ≤ 𝑤)
58	57	ralrimiva 3107	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → ∀𝑤 ∈ (𝐴𝑂𝐵)𝐴 ≤ 𝑤)
59		infxrgelb 12998	. . . 4 ⊢ (((𝐴𝑂𝐵) ⊆ ℝ^* ∧ 𝐴 ∈ ℝ^) → (𝐴 ≤ inf((𝐴𝑂𝐵), ℝ^, < ) ↔ ∀𝑤 ∈ (𝐴𝑂𝐵)𝐴 ≤ 𝑤))
60	7, 10, 59	syl2anc 583	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → (𝐴 ≤ inf((𝐴𝑂𝐵), ℝ^*, < ) ↔ ∀𝑤 ∈ (𝐴𝑂𝐵)𝐴 ≤ 𝑤))
61	58, 60	mpbird 256	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → 𝐴 ≤ inf((𝐴𝑂𝐵), ℝ^*, < ))
62	9, 10, 52, 61	xrletrid 12818	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ (𝐴𝑂𝐵) ≠ ∅) → inf((𝐴𝑂𝐵), ℝ^*, < ) = 𝐴)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1539 ∃wex 1783 ∈ wcel 2108 ≠ wne 2942 ∀wral 3063 ∃wrex 3064 {crab 3067 ⊆ wss 3883 ∅c0 4253 class class class wbr 5070 (class class class)co 7255 ∈ cmpo 7257 infcinf 9130 ℝ^*cxr 10939 < clt 10940 ≤ cle 10941 ℚcq 12617

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-1st 7804 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-sup 9131 df-inf 9132 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-n0 12164 df-z 12250 df-uz 12512 df-q 12618

This theorem is referenced by: ioorf 24642 ioorinv2 24644 ioossioobi 42945

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