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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 8083 | . . 3 ⊢ -∞ ∈ ℝ* | |
| 2 | pnfxr 8079 | . . 3 ⊢ +∞ ∈ ℝ* | |
| 3 | iooval2 9990 | . . 3 ⊢ ((-∞ ∈ ℝ* ∧ +∞ ∈ ℝ*) → (-∞(,)+∞) = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)}) | |
| 4 | 1, 2, 3 | mp2an 426 | . 2 ⊢ (-∞(,)+∞) = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)} |
| 5 | rabid2 2674 | . . 3 ⊢ (ℝ = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)} ↔ ∀𝑥 ∈ ℝ (-∞ < 𝑥 ∧ 𝑥 < +∞)) | |
| 6 | mnflt 9858 | . . . 4 ⊢ (𝑥 ∈ ℝ → -∞ < 𝑥) | |
| 7 | ltpnf 9855 | . . . 4 ⊢ (𝑥 ∈ ℝ → 𝑥 < +∞) | |
| 8 | 6, 7 | jca 306 | . . 3 ⊢ (𝑥 ∈ ℝ → (-∞ < 𝑥 ∧ 𝑥 < +∞)) |
| 9 | 5, 8 | mprgbir 2555 | . 2 ⊢ ℝ = {𝑥 ∈ ℝ ∣ (-∞ < 𝑥 ∧ 𝑥 < +∞)} |
| 10 | 4, 9 | eqtr4i 2220 | 1 ⊢ (-∞(,)+∞) = ℝ |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 = wceq 1364 ∈ wcel 2167 {crab 2479 class class class wbr 4033 (class class class)co 5922 ℝcr 7878 +∞cpnf 8058 -∞cmnf 8059 ℝ*cxr 8060 < clt 8061 (,)cioo 9963 |
| 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 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4151 ax-pow 4207 ax-pr 4242 ax-un 4468 ax-setind 4573 ax-cnex 7970 ax-resscn 7971 ax-pre-ltirr 7991 ax-pre-ltwlin 7992 ax-pre-lttrn 7993 |
| This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-rab 2484 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-uni 3840 df-br 4034 df-opab 4095 df-id 4328 df-po 4331 df-iso 4332 df-xp 4669 df-rel 4670 df-cnv 4671 df-co 4672 df-dm 4673 df-iota 5219 df-fun 5260 df-fv 5266 df-ov 5925 df-oprab 5926 df-mpo 5927 df-pnf 8063 df-mnf 8064 df-xr 8065 df-ltxr 8066 df-le 8067 df-ioo 9967 |
| This theorem is referenced by: unirnioo 10048 blssioo 14789 |
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