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| Mirrors > Home > MPE Home > Th. List > xrge0nre | Structured version Visualization version GIF version | ||
| Description: An extended real which is not a real is plus infinity. (Contributed by Thierry Arnoux, 16-Oct-2017.) |
| Ref | Expression |
|---|---|
| xrge0nre | ⊢ ((𝐴 ∈ (0[,]+∞) ∧ ¬ 𝐴 ∈ ℝ) → 𝐴 = +∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eliccxr 13379 | . . 3 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ∈ ℝ*) | |
| 2 | xrge0neqmnf 13396 | . . 3 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ≠ -∞) | |
| 3 | xrnemnf 13059 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐴 ≠ -∞) ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞)) | |
| 4 | 3 | biimpi 217 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐴 ≠ -∞) → (𝐴 ∈ ℝ ∨ 𝐴 = +∞)) |
| 5 | 1, 2, 4 | syl2anc 590 | . 2 ⊢ (𝐴 ∈ (0[,]+∞) → (𝐴 ∈ ℝ ∨ 𝐴 = +∞)) |
| 6 | 5 | orcanai 1010 | 1 ⊢ ((𝐴 ∈ (0[,]+∞) ∧ ¬ 𝐴 ∈ ℝ) → 𝐴 = +∞) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 396 ∨ wo 853 = wceq 1547 ∈ wcel 2119 ≠ wne 2934 (class class class)co 7356 ℝcr 11028 0cc0 11029 +∞cpnf 11167 -∞cmnf 11168 ℝ*cxr 11169 [,]cicc 13292 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-addrcl 11090 ax-rnegex 11100 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-iun 4923 df-br 5073 df-opab 5135 df-mpt 5154 df-id 5513 df-po 5526 df-so 5527 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-ov 7359 df-oprab 7360 df-mpo 7361 df-1st 7931 df-2nd 7932 df-er 8633 df-en 8884 df-dom 8885 df-sdom 8886 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-icc 13296 |
| This theorem is referenced by: voliune 34413 volfiniune 34414 omssubadd 34484 ismbl3 46429 |
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