ioopos - Metamath Proof Explorer

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Theorem ioopos 13385

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 11221	. . 3 ⊢ 0 ∈ ℝ^*
2		pnfxr 11228	. . 3 ⊢ +∞ ∈ ℝ^*
3		iooval2 13339	. . 3 ⊢ ((0 ∈ ℝ^* ∧ +∞ ∈ ℝ^*) → (0(,)+∞) = {𝑥 ∈ ℝ ∣ (0 < 𝑥 ∧ 𝑥 < +∞)})
4	1, 2, 3	mp2an 692	. 2 ⊢ (0(,)+∞) = {𝑥 ∈ ℝ ∣ (0 < 𝑥 ∧ 𝑥 < +∞)}
5		ltpnf 13080	. . . 4 ⊢ (𝑥 ∈ ℝ → 𝑥 < +∞)
6	5	biantrud 531	. . 3 ⊢ (𝑥 ∈ ℝ → (0 < 𝑥 ↔ (0 < 𝑥 ∧ 𝑥 < +∞)))
7	6	rabbiia 3409	. 2 ⊢ {𝑥 ∈ ℝ ∣ 0 < 𝑥} = {𝑥 ∈ ℝ ∣ (0 < 𝑥 ∧ 𝑥 < +∞)}
8	4, 7	eqtr4i 2755	1 ⊢ (0(,)+∞) = {𝑥 ∈ ℝ ∣ 0 < 𝑥}

Colors of variables: wff setvar class

Syntax hints: ∧ wa 395 = wceq 1540 ∈ wcel 2109 {crab 3405 class class class wbr 5107 (class class class)co 7387 ℝcr 11067 0cc0 11068 +∞cpnf 11205 ℝ^*cxr 11207 < clt 11208 (,)cioo 13306

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 ax-cnex 11124 ax-resscn 11125 ax-1cn 11126 ax-addrcl 11129 ax-rnegex 11139 ax-cnre 11141 ax-pre-lttri 11142 ax-pre-lttrn 11143

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-iun 4957 df-br 5108 df-opab 5170 df-mpt 5189 df-id 5533 df-po 5546 df-so 5547 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-ov 7390 df-oprab 7391 df-mpo 7392 df-1st 7968 df-2nd 7969 df-er 8671 df-en 8919 df-dom 8920 df-sdom 8921 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 df-ioo 13310

This theorem is referenced by: ioorp 13386 repos 13407

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