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| Mirrors > Home > MPE Home > Th. List > eliooxr | Structured version Visualization version GIF version | ||
| Description: A nonempty open interval spans an interval of extended reals. (Contributed by NM, 17-Aug-2008.) |
| Ref | Expression |
|---|---|
| eliooxr | ⊢ (𝐴 ∈ (𝐵(,)𝐶) → (𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ*)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ne0i 4295 | . 2 ⊢ (𝐴 ∈ (𝐵(,)𝐶) → (𝐵(,)𝐶) ≠ ∅) | |
| 2 | ndmioo 13378 | . . 3 ⊢ (¬ (𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ*) → (𝐵(,)𝐶) = ∅) | |
| 3 | 2 | necon1ai 2986 | . 2 ⊢ ((𝐵(,)𝐶) ≠ ∅ → (𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ*)) |
| 4 | 1, 3 | syl 17 | 1 ⊢ (𝐴 ∈ (𝐵(,)𝐶) → (𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ*)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 399 ∈ wcel 2144 ≠ wne 2959 ∅c0 4287 (class class class)co 7398 ℝ*cxr 11217 (,)cioo 13351 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-sep 5248 ax-nul 5258 ax-pr 5392 ax-un 7720 ax-cnex 11131 ax-resscn 11132 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3079 df-rex 3089 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-id 5544 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-fv 6531 df-ov 7401 df-oprab 7402 df-mpo 7403 df-1st 7972 df-2nd 7973 df-xr 11222 df-ioo 13355 |
| This theorem is referenced by: eliooord 13411 elioo4g 13412 ioorebas 13457 tgioo 24858 ioorcl2 25636 ioorinv2 25639 fct2relem 34893 iooelexlt 37861 |
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