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| Mirrors > Home > MPE Home > Th. List > Mathboxes > xrge0nemnfd | Structured version Visualization version GIF version | ||
| Description: A nonnegative extended real is not minus infinity. (Contributed by Glauco Siliprandi, 17-Aug-2020.) |
| Ref | Expression |
|---|---|
| xrge0nemnfd.1 | ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) |
| Ref | Expression |
|---|---|
| xrge0nemnfd | ⊢ (𝜑 → 𝐴 ≠ -∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mnfxr 11187 | . . 3 ⊢ -∞ ∈ ℝ* | |
| 2 | 1 | a1i 11 | . 2 ⊢ (𝜑 → -∞ ∈ ℝ*) |
| 3 | iccssxr 13344 | . . 3 ⊢ (0[,]+∞) ⊆ ℝ* | |
| 4 | xrge0nemnfd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
| 5 | 3, 4 | sselid 3929 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| 6 | 0xr 11177 | . . . 4 ⊢ 0 ∈ ℝ* | |
| 7 | 6 | a1i 11 | . . 3 ⊢ (𝜑 → 0 ∈ ℝ*) |
| 8 | mnflt0 13037 | . . . 4 ⊢ -∞ < 0 | |
| 9 | 8 | a1i 11 | . . 3 ⊢ (𝜑 → -∞ < 0) |
| 10 | pnfxr 11184 | . . . . 5 ⊢ +∞ ∈ ℝ* | |
| 11 | 10 | a1i 11 | . . . 4 ⊢ (𝜑 → +∞ ∈ ℝ*) |
| 12 | iccgelb 13316 | . . . 4 ⊢ ((0 ∈ ℝ* ∧ +∞ ∈ ℝ* ∧ 𝐴 ∈ (0[,]+∞)) → 0 ≤ 𝐴) | |
| 13 | 7, 11, 4, 12 | syl3anc 1373 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐴) |
| 14 | 2, 7, 5, 9, 13 | xrltletrd 13073 | . 2 ⊢ (𝜑 → -∞ < 𝐴) |
| 15 | 2, 5, 14 | xrgtned 13076 | 1 ⊢ (𝜑 → 𝐴 ≠ -∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2113 ≠ wne 2930 class class class wbr 5096 (class class class)co 7356 0cc0 11024 +∞cpnf 11161 -∞cmnf 11162 ℝ*cxr 11163 < clt 11164 ≤ cle 11165 [,]cicc 13262 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2706 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 ax-cnex 11080 ax-resscn 11081 ax-1cn 11082 ax-addrcl 11085 ax-rnegex 11095 ax-cnre 11097 ax-pre-lttri 11098 ax-pre-lttrn 11099 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-nfc 2883 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-uni 4862 df-iun 4946 df-br 5097 df-opab 5159 df-mpt 5178 df-id 5517 df-po 5530 df-so 5531 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-ov 7359 df-oprab 7360 df-mpo 7361 df-1st 7931 df-2nd 7932 df-er 8633 df-en 8882 df-dom 8883 df-sdom 8884 df-pnf 11166 df-mnf 11167 df-xr 11168 df-ltxr 11169 df-le 11170 df-icc 13266 |
| This theorem is referenced by: ovolsplit 46174 caragenuncllem 46698 |
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