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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 11249 | . . 3 ⊢ -∞ ∈ ℝ* | |
| 2 | 1 | a1i 11 | . 2 ⊢ (𝜑 → -∞ ∈ ℝ*) |
| 3 | iccssxr 13404 | . . 3 ⊢ (0[,]+∞) ⊆ ℝ* | |
| 4 | xrge0nemnfd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
| 5 | 3, 4 | sselid 3952 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| 6 | 0xr 11239 | . . . 4 ⊢ 0 ∈ ℝ* | |
| 7 | 6 | a1i 11 | . . 3 ⊢ (𝜑 → 0 ∈ ℝ*) |
| 8 | mnflt0 13098 | . . . 4 ⊢ -∞ < 0 | |
| 9 | 8 | a1i 11 | . . 3 ⊢ (𝜑 → -∞ < 0) |
| 10 | pnfxr 11246 | . . . . 5 ⊢ +∞ ∈ ℝ* | |
| 11 | 10 | a1i 11 | . . . 4 ⊢ (𝜑 → +∞ ∈ ℝ*) |
| 12 | iccgelb 13376 | . . . 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 13134 | . 2 ⊢ (𝜑 → -∞ < 𝐴) |
| 15 | 2, 5, 14 | xrgtned 45291 | 1 ⊢ (𝜑 → 𝐴 ≠ -∞) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 ≠ wne 2927 class class class wbr 5115 (class class class)co 7394 0cc0 11086 +∞cpnf 11223 -∞cmnf 11224 ℝ*cxr 11225 < clt 11226 ≤ cle 11227 [,]cicc 13322 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5259 ax-nul 5269 ax-pow 5328 ax-pr 5395 ax-un 7718 ax-cnex 11142 ax-resscn 11143 ax-1cn 11144 ax-addrcl 11147 ax-rnegex 11157 ax-cnre 11159 ax-pre-lttri 11160 ax-pre-lttrn 11161 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2880 df-ne 2928 df-nel 3032 df-ral 3047 df-rex 3056 df-rab 3412 df-v 3457 df-sbc 3762 df-csb 3871 df-dif 3925 df-un 3927 df-in 3929 df-ss 3939 df-nul 4305 df-if 4497 df-pw 4573 df-sn 4598 df-pr 4600 df-op 4604 df-uni 4880 df-iun 4965 df-br 5116 df-opab 5178 df-mpt 5197 df-id 5541 df-po 5554 df-so 5555 df-xp 5652 df-rel 5653 df-cnv 5654 df-co 5655 df-dm 5656 df-rn 5657 df-res 5658 df-ima 5659 df-iota 6472 df-fun 6521 df-fn 6522 df-f 6523 df-f1 6524 df-fo 6525 df-f1o 6526 df-fv 6527 df-ov 7397 df-oprab 7398 df-mpo 7399 df-1st 7977 df-2nd 7978 df-er 8682 df-en 8923 df-dom 8924 df-sdom 8925 df-pnf 11228 df-mnf 11229 df-xr 11230 df-ltxr 11231 df-le 11232 df-icc 13326 |
| This theorem is referenced by: ovolsplit 45959 caragenuncllem 46483 |
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