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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 13383 | . . 3 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ∈ ℝ*) | |
| 2 | xrge0neqmnf 13400 | . . 3 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ≠ -∞) | |
| 3 | xrnemnf 13063 | . . . 4 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐴 ≠ -∞) ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞)) | |
| 4 | 3 | biimpi 218 | . . 3 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐴 ≠ -∞) → (𝐴 ∈ ℝ ∨ 𝐴 = +∞)) |
| 5 | 1, 2, 4 | syl2anc 591 | . 2 ⊢ (𝐴 ∈ (0[,]+∞) → (𝐴 ∈ ℝ ∨ 𝐴 = +∞)) |
| 6 | 5 | orcanai 1011 | 1 ⊢ ((𝐴 ∈ (0[,]+∞) ∧ ¬ 𝐴 ∈ ℝ) → 𝐴 = +∞) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 397 ∨ wo 854 = wceq 1548 ∈ wcel 2121 ≠ wne 2936 (class class class)co 7359 ℝcr 11033 0cc0 11034 +∞cpnf 11172 -∞cmnf 11173 ℝ*cxr 11174 [,]cicc 13296 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-10 2154 ax-11 2170 ax-12 2191 ax-ext 2713 ax-sep 5220 ax-nul 5230 ax-pow 5296 ax-pr 5364 ax-un 7681 ax-cnex 11090 ax-resscn 11091 ax-1cn 11092 ax-addrcl 11095 ax-rnegex 11105 ax-cnre 11107 ax-pre-lttri 11108 ax-pre-lttrn 11109 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3or 1094 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-nf 1792 df-sb 2075 df-mo 2545 df-eu 2575 df-clab 2720 df-cleq 2733 df-clel 2816 df-nfc 2890 df-ne 2937 df-nel 3041 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-sbc 3725 df-csb 3833 df-dif 3887 df-un 3889 df-in 3891 df-ss 3901 df-nul 4264 df-if 4457 df-pw 4533 df-sn 4558 df-pr 4560 df-op 4564 df-uni 4841 df-iun 4925 df-br 5075 df-opab 5137 df-mpt 5156 df-id 5515 df-po 5528 df-so 5529 df-xp 5626 df-rel 5627 df-cnv 5628 df-co 5629 df-dm 5630 df-rn 5631 df-res 5632 df-ima 5633 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-ov 7362 df-oprab 7363 df-mpo 7364 df-1st 7933 df-2nd 7934 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-pnf 11177 df-mnf 11178 df-xr 11179 df-ltxr 11180 df-le 11181 df-icc 13300 |
| This theorem is referenced by: voliune 34423 volfiniune 34424 omssubadd 34494 ismbl3 46441 |
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