ioopos - Metamath Proof Explorer

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Theorem ioopos 13352

Description: The set of positive reals expressed as an open interval. (Contributed by NM, 7-May-2007.)

**Assertion**
Ref	Expression
ioopos	⊢ (0(,)+∞) = {𝑥 ∈ ℝ ∣ 0 < 𝑥}

**Proof of Theorem ioopos**
Step	Hyp	Ref	Expression
1		0xr 11191	. . 3 ⊢ 0 ∈ ℝ^*
2		pnfxr 11198	. . 3 ⊢ +∞ ∈ ℝ^*
3		iooval2 13306	. . 3 ⊢ ((0 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → (0(,)+∞) = {𝑥 ∈ ℝ ∣ (0 < 𝑥 ∧ 𝑥 < +∞)})
4	1, 2, 3	mp2an 693	. 2 ⊢ (0(,)+∞) = {𝑥 ∈ ℝ ∣ (0 < 𝑥 ∧ 𝑥 < +∞)}
5		ltpnf 13046	. . . 4 ⊢ (𝑥 ∈ ℝ → 𝑥 < +∞)
6	5	biantrud 531	. . 3 ⊢ (𝑥 ∈ ℝ → (0 < 𝑥 ↔ (0 < 𝑥 ∧ 𝑥 < +∞)))
7	6	rabbiia 3405	. 2 ⊢ {𝑥 ∈ ℝ ∣ 0 < 𝑥} = {𝑥 ∈ ℝ ∣ (0 < 𝑥 ∧ 𝑥 < +∞)}
8	4, 7	eqtr4i 2763	1 ⊢ (0(,)+∞) = {𝑥 ∈ ℝ ∣ 0 < 𝑥}

Colors of variables: wff setvar class

Syntax hints: ∧ wa 395 = wceq 1542 ∈ wcel 2114 {crab 3401 class class class wbr 5100 (class class class)co 7368 ℝcr 11037 0cc0 11038 +∞cpnf 11175 ℝ^*cxr 11177 < clt 11178 (,)cioo 13273

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 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-addrcl 11099 ax-rnegex 11109 ax-cnre 11111 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-po 5540 df-so 5541 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-ov 7371 df-oprab 7372 df-mpo 7373 df-1st 7943 df-2nd 7944 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-ioo 13277

This theorem is referenced by: ioorp 13353 repos 13374

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