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| Mirrors > Home > ILE Home > Th. List > ioomax | GIF version | ||
| Description: The open interval from minus to plus infinity. (Contributed by NM, 6-Feb-2007.) |
| Ref | Expression |
|---|---|
| ioomax | ⊢ (-∞(,)+∞) = ℝ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mnfxr 8278 | . . 3 ⊢ -∞ ∈ ℝ* | |
| 2 | pnfxr 8274 | . . 3 ⊢ +∞ ∈ ℝ* | |
| 3 | iooval2 10194 | . . 3 ⊢ ((-∞ ∈ ℝ* ∧ +∞ ∈ ℝ*) → (-∞(,)+∞) = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)}) | |
| 4 | 1, 2, 3 | mp2an 426 | . 2 ⊢ (-∞(,)+∞) = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)} |
| 5 | rabid2 2711 | . . 3 ⊢ (ℝ = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)} ↔ ∀𝑥 ∈ ℝ (-∞ < 𝑥 ∧ 𝑥 < +∞)) | |
| 6 | mnflt 10062 | . . . 4 ⊢ (𝑥 ∈ ℝ → -∞ < 𝑥) | |
| 7 | ltpnf 10059 | . . . 4 ⊢ (𝑥 ∈ ℝ → 𝑥 < +∞) | |
| 8 | 6, 7 | jca 306 | . . 3 ⊢ (𝑥 ∈ ℝ → (-∞ < 𝑥 ∧ 𝑥 < +∞)) |
| 9 | 5, 8 | mprgbir 2591 | . 2 ⊢ ℝ = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)} |
| 10 | 4, 9 | eqtr4i 2255 | 1 ⊢ (-∞(,)+∞) = ℝ |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 = wceq 1398 ∈ wcel 2202 {crab 2515 class class class wbr 4093 (class class class)co 6028 ℝcr 8074 +∞cpnf 8253 -∞cmnf 8254 ℝ*cxr 8255 < clt 8256 (,)cioo 10167 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-pre-ltirr 8187 ax-pre-ltwlin 8188 ax-pre-lttrn 8189 |
| This theorem depends on definitions: df-bi 117 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-nel 2499 df-ral 2516 df-rex 2517 df-rab 2520 df-v 2805 df-sbc 3033 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-opab 4156 df-id 4396 df-po 4399 df-iso 4400 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-iota 5293 df-fun 5335 df-fv 5341 df-ov 6031 df-oprab 6032 df-mpo 6033 df-pnf 8258 df-mnf 8259 df-xr 8260 df-ltxr 8261 df-le 8262 df-ioo 10171 |
| This theorem is referenced by: unirnioo 10252 blssioo 15347 |
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