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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 11201 | . . 3 ⊢ -∞ ∈ ℝ* | |
| 2 | 1 | a1i 11 | . 2 ⊢ (𝜑 → -∞ ∈ ℝ*) |
| 3 | iccssxr 13358 | . . 3 ⊢ (0[,]+∞) ⊆ ℝ* | |
| 4 | xrge0nemnfd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
| 5 | 3, 4 | sselid 3933 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| 6 | 0xr 11191 | . . . 4 ⊢ 0 ∈ ℝ* | |
| 7 | 6 | a1i 11 | . . 3 ⊢ (𝜑 → 0 ∈ ℝ*) |
| 8 | mnflt0 13051 | . . . 4 ⊢ -∞ < 0 | |
| 9 | 8 | a1i 11 | . . 3 ⊢ (𝜑 → -∞ < 0) |
| 10 | pnfxr 11198 | . . . . 5 ⊢ +∞ ∈ ℝ* | |
| 11 | 10 | a1i 11 | . . . 4 ⊢ (𝜑 → +∞ ∈ ℝ*) |
| 12 | iccgelb 13330 | . . . 4 ⊢ ((0 ∈ ℝ* ∧ +∞ ∈ ℝ* ∧ 𝐴 ∈ (0[,]+∞)) → 0 ≤ 𝐴) | |
| 13 | 7, 11, 4, 12 | syl3anc 1374 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐴) |
| 14 | 2, 7, 5, 9, 13 | xrltletrd 13087 | . 2 ⊢ (𝜑 → -∞ < 𝐴) |
| 15 | 2, 5, 14 | xrgtned 13090 | 1 ⊢ (𝜑 → 𝐴 ≠ -∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2933 class class class wbr 5100 (class class class)co 7368 0cc0 11038 +∞cpnf 11175 -∞cmnf 11176 ℝ*cxr 11177 < clt 11178 ≤ cle 11179 [,]cicc 13276 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-addrcl 11099 ax-rnegex 11109 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-id 5527 df-po 5540 df-so 5541 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-ov 7371 df-oprab 7372 df-mpo 7373 df-1st 7943 df-2nd 7944 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-icc 13280 |
| This theorem is referenced by: ovolsplit 46346 caragenuncllem 46870 |
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