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| Mirrors > Home > ILE Home > Th. List > ioof | GIF version | ||
| Description: The set of open intervals of extended reals maps to subsets of reals. (Contributed by NM, 7-Feb-2007.) (Revised by Mario Carneiro, 16-Nov-2013.) |
| Ref | Expression |
|---|---|
| ioof | ⊢ (,):(ℝ* × ℝ*)⟶𝒫 ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iooval 10293 | . . . 4 ⊢ ((𝑥 ∈ ℝ* ∧ 𝑦 ∈ ℝ*) → (𝑥(,)𝑦) = {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)}) | |
| 2 | ioossre 10320 | . . . . 5 ⊢ (𝑥(,)𝑦) ⊆ ℝ | |
| 3 | df-ov 6082 | . . . . . . 7 ⊢ (𝑥(,)𝑦) = ((,)‘〈𝑥, 𝑦〉) | |
| 4 | iooex 10292 | . . . . . . . 8 ⊢ (,) ∈ V | |
| 5 | vex 2824 | . . . . . . . . 9 ⊢ 𝑥 ∈ V | |
| 6 | vex 2824 | . . . . . . . . 9 ⊢ 𝑦 ∈ V | |
| 7 | 5, 6 | opex 4367 | . . . . . . . 8 ⊢ 〈𝑥, 𝑦〉 ∈ V |
| 8 | 4, 7 | fvex 5713 | . . . . . . 7 ⊢ ((,)‘〈𝑥, 𝑦〉) ∈ V |
| 9 | 3, 8 | eqeltri 2311 | . . . . . 6 ⊢ (𝑥(,)𝑦) ∈ V |
| 10 | 9 | elpw 3694 | . . . . 5 ⊢ ((𝑥(,)𝑦) ∈ 𝒫 ℝ ↔ (𝑥(,)𝑦) ⊆ ℝ) |
| 11 | 2, 10 | mpbir 146 | . . . 4 ⊢ (𝑥(,)𝑦) ∈ 𝒫 ℝ |
| 12 | 1, 11 | eqeltrrdi 2330 | . . 3 ⊢ ((𝑥 ∈ ℝ* ∧ 𝑦 ∈ ℝ*) → {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)} ∈ 𝒫 ℝ) |
| 13 | 12 | rgen2a 2604 | . 2 ⊢ ∀𝑥 ∈ ℝ* ∀𝑦 ∈ ℝ* {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)} ∈ 𝒫 ℝ |
| 14 | df-ioo 10277 | . . 3 ⊢ (,) = (𝑥 ∈ ℝ*, 𝑦 ∈ ℝ* ↦ {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)}) | |
| 15 | 14 | fmpo 6431 | . 2 ⊢ (∀𝑥 ∈ ℝ* ∀𝑦 ∈ ℝ* {𝑧 ∈ ℝ* ∣ (𝑥 < 𝑧 ∧ 𝑧 < 𝑦)} ∈ 𝒫 ℝ ↔ (,):(ℝ* × ℝ*)⟶𝒫 ℝ) |
| 16 | 13, 15 | mpbi 145 | 1 ⊢ (,):(ℝ* × ℝ*)⟶𝒫 ℝ |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ∈ wcel 2209 ∀wral 2528 {crab 2532 Vcvv 2821 ⊆ wss 3220 𝒫 cpw 3688 〈cop 3711 class class class wbr 4128 × cxp 4770 ⟶wf 5371 ‘cfv 5375 (class class class)co 6079 ℝcr 8172 ℝ*cxr 8353 < clt 8354 (,)cioo 10273 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4247 ax-pow 4309 ax-pr 4344 ax-un 4576 ax-setind 4682 ax-cnex 8264 ax-resscn 8265 ax-pre-ltirr 8285 ax-pre-ltwlin 8286 ax-pre-lttrn 8287 |
| This theorem depends on definitions: df-bi 117 df-3or 1010 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-iun 4012 df-br 4129 df-opab 4191 df-mpt 4192 df-id 4436 df-po 4439 df-iso 4440 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-rn 4783 df-res 4784 df-ima 4785 df-iota 5335 df-fun 5377 df-fn 5378 df-f 5379 df-fv 5383 df-ov 6082 df-oprab 6083 df-mpo 6084 df-1st 6368 df-2nd 6369 df-pnf 8356 df-mnf 8357 df-xr 8358 df-ltxr 8359 df-le 8360 df-ioo 10277 |
| This theorem is referenced by: unirnioo 10358 dfioo2 10359 ioorebasg 10360 qtopbasss 15605 retopbas 15607 tgioo 15638 tgqioo 15639 |
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