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Mirrors > Home > ILE Home > Th. List > dfrp2 | GIF version |
Description: Alternate definition of the positive real numbers. (Contributed by Thierry Arnoux, 4-May-2020.) |
Ref | Expression |
---|---|
dfrp2 | ⊢ ℝ+ = (0(,)+∞) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltpnf 9680 | . . . . . 6 ⊢ (𝑥 ∈ ℝ → 𝑥 < +∞) | |
2 | 1 | adantr 274 | . . . . 5 ⊢ ((𝑥 ∈ ℝ ∧ 0 < 𝑥) → 𝑥 < +∞) |
3 | 2 | pm4.71i 389 | . . . 4 ⊢ ((𝑥 ∈ ℝ ∧ 0 < 𝑥) ↔ ((𝑥 ∈ ℝ ∧ 0 < 𝑥) ∧ 𝑥 < +∞)) |
4 | df-3an 965 | . . . 4 ⊢ ((𝑥 ∈ ℝ ∧ 0 < 𝑥 ∧ 𝑥 < +∞) ↔ ((𝑥 ∈ ℝ ∧ 0 < 𝑥) ∧ 𝑥 < +∞)) | |
5 | 3, 4 | bitr4i 186 | . . 3 ⊢ ((𝑥 ∈ ℝ ∧ 0 < 𝑥) ↔ (𝑥 ∈ ℝ ∧ 0 < 𝑥 ∧ 𝑥 < +∞)) |
6 | elrp 9555 | . . 3 ⊢ (𝑥 ∈ ℝ+ ↔ (𝑥 ∈ ℝ ∧ 0 < 𝑥)) | |
7 | 0xr 7918 | . . . 4 ⊢ 0 ∈ ℝ* | |
8 | pnfxr 7924 | . . . 4 ⊢ +∞ ∈ ℝ* | |
9 | elioo2 9818 | . . . 4 ⊢ ((0 ∈ ℝ* ∧ +∞ ∈ ℝ*) → (𝑥 ∈ (0(,)+∞) ↔ (𝑥 ∈ ℝ ∧ 0 < 𝑥 ∧ 𝑥 < +∞))) | |
10 | 7, 8, 9 | mp2an 423 | . . 3 ⊢ (𝑥 ∈ (0(,)+∞) ↔ (𝑥 ∈ ℝ ∧ 0 < 𝑥 ∧ 𝑥 < +∞)) |
11 | 5, 6, 10 | 3bitr4i 211 | . 2 ⊢ (𝑥 ∈ ℝ+ ↔ 𝑥 ∈ (0(,)+∞)) |
12 | 11 | eqriv 2154 | 1 ⊢ ℝ+ = (0(,)+∞) |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 ↔ wb 104 ∧ w3a 963 = wceq 1335 ∈ wcel 2128 class class class wbr 3965 (class class class)co 5821 ℝcr 7725 0cc0 7726 +∞cpnf 7903 ℝ*cxr 7905 < clt 7906 ℝ+crp 9553 (,)cioo 9785 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1427 ax-7 1428 ax-gen 1429 ax-ie1 1473 ax-ie2 1474 ax-8 1484 ax-10 1485 ax-11 1486 ax-i12 1487 ax-bndl 1489 ax-4 1490 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-13 2130 ax-14 2131 ax-ext 2139 ax-sep 4082 ax-pow 4135 ax-pr 4169 ax-un 4393 ax-setind 4495 ax-cnex 7817 ax-resscn 7818 ax-1re 7820 ax-addrcl 7823 ax-rnegex 7835 ax-pre-ltirr 7838 ax-pre-ltwlin 7839 ax-pre-lttrn 7840 |
This theorem depends on definitions: df-bi 116 df-3or 964 df-3an 965 df-tru 1338 df-fal 1341 df-nf 1441 df-sb 1743 df-eu 2009 df-mo 2010 df-clab 2144 df-cleq 2150 df-clel 2153 df-nfc 2288 df-ne 2328 df-nel 2423 df-ral 2440 df-rex 2441 df-rab 2444 df-v 2714 df-sbc 2938 df-dif 3104 df-un 3106 df-in 3108 df-ss 3115 df-pw 3545 df-sn 3566 df-pr 3567 df-op 3569 df-uni 3773 df-br 3966 df-opab 4026 df-id 4253 df-po 4256 df-iso 4257 df-xp 4591 df-rel 4592 df-cnv 4593 df-co 4594 df-dm 4595 df-iota 5134 df-fun 5171 df-fv 5177 df-ov 5824 df-oprab 5825 df-mpo 5826 df-pnf 7908 df-mnf 7909 df-xr 7910 df-ltxr 7911 df-le 7912 df-rp 9554 df-ioo 9789 |
This theorem is referenced by: (None) |
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