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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 13388 | . 2 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ∈ ℝ*) | |
| 2 | 0xr 11192 | . . 3 ⊢ 0 ∈ ℝ* | |
| 3 | pnfxr 11199 | . . 3 ⊢ +∞ ∈ ℝ* | |
| 4 | iccgelb 13355 | . . 3 ⊢ ((0 ∈ ℝ* ∧ +∞ ∈ ℝ* ∧ 𝐴 ∈ (0[,]+∞)) → 0 ≤ 𝐴) | |
| 5 | 2, 3, 4 | mp3an12 1454 | . 2 ⊢ (𝐴 ∈ (0[,]+∞) → 0 ≤ 𝐴) |
| 6 | ge0nemnf 13125 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → 𝐴 ≠ -∞) | |
| 7 | 1, 5, 6 | syl2anc 585 | 1 ⊢ (𝐴 ∈ (0[,]+∞) → 𝐴 ≠ -∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ≠ wne 2932 class class class wbr 5085 (class class class)co 7367 0cc0 11038 +∞cpnf 11176 -∞cmnf 11177 ℝ*cxr 11178 ≤ cle 11180 [,]cicc 13301 |
| 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 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 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 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-po 5539 df-so 5540 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-ov 7370 df-oprab 7371 df-mpo 7372 df-1st 7942 df-2nd 7943 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-icc 13305 |
| This theorem is referenced by: xrge0nre 13406 xrge0adddir 33078 xrge0npcan 33080 hasheuni 34229 esumcvgre 34235 carsgclctunlem2 34463 sge0split 46837 sge0nemnf 46848 |
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