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Theorem elioomnf 13397

Description: Membership in an unbounded interval of extended reals. (Contributed by Mario Carneiro, 18-Jun-2014.)

**Assertion**
Ref	Expression
elioomnf	⊢ (𝐴 ∈ ℝ^* → (𝐵 ∈ (-∞(,)𝐴) ↔ (𝐵 ∈ ℝ ∧ 𝐵 < 𝐴)))

**Proof of Theorem elioomnf**
Step	Hyp	Ref	Expression
1		mnfxr 11202	. . 3 ⊢ -∞ ∈ ℝ^*
2		elioo2 13339	. . 3 ⊢ ((-∞ ∈ ℝ^* ∧ 𝐴 ∈ ℝ^*) → (𝐵 ∈ (-∞(,)𝐴) ↔ (𝐵 ∈ ℝ ∧ -∞ < 𝐵 ∧ 𝐵 < 𝐴)))
3	1, 2	mpan 691	. 2 ⊢ (𝐴 ∈ ℝ^* → (𝐵 ∈ (-∞(,)𝐴) ↔ (𝐵 ∈ ℝ ∧ -∞ < 𝐵 ∧ 𝐵 < 𝐴)))
4		an32 647	. . 3 ⊢ (((𝐵 ∈ ℝ ∧ -∞ < 𝐵) ∧ 𝐵 < 𝐴) ↔ ((𝐵 ∈ ℝ ∧ 𝐵 < 𝐴) ∧ -∞ < 𝐵))
5		df-3an 1089	. . 3 ⊢ ((𝐵 ∈ ℝ ∧ -∞ < 𝐵 ∧ 𝐵 < 𝐴) ↔ ((𝐵 ∈ ℝ ∧ -∞ < 𝐵) ∧ 𝐵 < 𝐴))
6		mnflt 13074	. . . . 5 ⊢ (𝐵 ∈ ℝ → -∞ < 𝐵)
7	6	adantr 480	. . . 4 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 < 𝐴) → -∞ < 𝐵)
8	7	pm4.71i 559	. . 3 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 < 𝐴) ↔ ((𝐵 ∈ ℝ ∧ 𝐵 < 𝐴) ∧ -∞ < 𝐵))
9	4, 5, 8	3bitr4i 303	. 2 ⊢ ((𝐵 ∈ ℝ ∧ -∞ < 𝐵 ∧ 𝐵 < 𝐴) ↔ (𝐵 ∈ ℝ ∧ 𝐵 < 𝐴))
10	3, 9	bitrdi 287	1 ⊢ (𝐴 ∈ ℝ^* → (𝐵 ∈ (-∞(,)𝐴) ↔ (𝐵 ∈ ℝ ∧ 𝐵 < 𝐴)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 ∈ wcel 2114 class class class wbr 5085 (class class class)co 7367 ℝcr 11037 -∞cmnf 11177 ℝ^*cxr 11178 < clt 11179 (,)cioo 13298

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-pre-lttri 11112 ax-pre-lttrn 11113

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 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 3062 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-po 5539 df-so 5540 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-ov 7370 df-oprab 7371 df-mpo 7372 df-1st 7942 df-2nd 7943 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-ioo 13302

This theorem is referenced by: bndth 24925 mbfmulc2lem 25614 mbfposr 25619 ismbf3d 25621 mbfi1fseqlem4 25685 itg2monolem1 25717 dvne0 25978 mbfposadd 37988 itg2addnclem2 37993 iblabsnclem 38004 ftc1anclem1 38014 ftc1anclem6 38019 redvmptabs 42792 rfcnpre2 45462 i0oii 49395

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