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| Mirrors > Home > MPE Home > Th. List > xrge0neqmnf | Structured version Visualization version GIF version | ||
| Description: A nonnegative extended real is not equal to minus infinity. (Contributed by Thierry Arnoux, 9-Jun-2017.) (Proof shortened by Glauco Siliprandi, 17-Aug-2020.) |
| Ref | Expression |
|---|---|
| xrge0neqmnf | ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ≠ -∞) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eliccxr 13521 | . 2 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ∈ ℝ*) | |
| 2 | 0xr 11313 | . . 3 ⊢ 0 ∈ ℝ* | |
| 3 | pnfxr 11320 | . . 3 ⊢ +∞ ∈ ℝ* | |
| 4 | iccgelb 13488 | . . 3 ⊢ ((0 ∈ ℝ* ∧ +∞ ∈ ℝ* ∧ 𝐴 ∈ (0[,]+∞)) → 0 ≤ 𝐴) | |
| 5 | 2, 3, 4 | mp3an12 1480 | . 2 ⊢ (𝐴 ∈ (0[,]+∞) → 0 ≤ 𝐴) |
| 6 | ge0nemnf 13258 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → 𝐴 ≠ -∞) | |
| 7 | 1, 5, 6 | syl2anc 596 | 1 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ≠ -∞) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2145 ≠ wne 2955 class class class wbr 5103 (class class class)co 7409 0cc0 11157 +∞cpnf 11297 -∞cmnf 11298 ℝ*cxr 11299 ≤ cle 11301 [,]cicc 13434 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7735 ax-cnex 11213 ax-resscn 11214 ax-1cn 11215 ax-addrcl 11218 ax-rnegex 11228 ax-cnre 11230 ax-pre-lttri 11231 ax-pre-lttrn 11232 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5543 df-po 5556 df-so 5557 df-xp 5654 df-rel 5655 df-cnv 5656 df-co 5657 df-dm 5658 df-rn 5659 df-res 5660 df-ima 5661 df-iota 6484 df-fun 6530 df-fn 6531 df-f 6532 df-f1 6533 df-fo 6534 df-f1o 6535 df-fv 6536 df-ov 7412 df-oprab 7413 df-mpo 7414 df-1st 7985 df-2nd 7986 df-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 df-pnf 11302 df-mnf 11303 df-xr 11304 df-ltxr 11305 df-le 11306 df-icc 13438 |
| This theorem is used by: xrge0nre 13539 xrge0adddir 33498 xrge0npcan 33500 hasheuni 34636 esumcvgre 34642 carsgclctunlem2 34871 sge0split 47335 sge0nemnf 47346 |
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