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| Mirrors > Home > ILE Home > Th. List > ge0gtmnf | GIF version | ||
| Description: A nonnegative extended real is greater than negative infinity. (Contributed by Mario Carneiro, 20-Aug-2015.) |
| Ref | Expression |
|---|---|
| ge0gtmnf | ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → -∞ < 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mnflt0 10117 | . 2 ⊢ -∞ < 0 | |
| 2 | mnfxr 8330 | . . . 4 ⊢ -∞ ∈ ℝ* | |
| 3 | 0xr 8320 | . . . 4 ⊢ 0 ∈ ℝ* | |
| 4 | xrltletr 10140 | . . . 4 ⊢ ((-∞ ∈ ℝ* ∧ 0 ∈ ℝ* ∧ 𝐴 ∈ ℝ*) → ((-∞ < 0 ∧ 0 ≤ 𝐴) → -∞ < 𝐴)) | |
| 5 | 2, 3, 4 | mp3an12 1364 | . . 3 ⊢ (𝐴 ∈ ℝ* → ((-∞ < 0 ∧ 0 ≤ 𝐴) → -∞ < 𝐴)) |
| 6 | 5 | imp 124 | . 2 ⊢ ((𝐴 ∈ ℝ* ∧ (-∞ < 0 ∧ 0 ≤ 𝐴)) → -∞ < 𝐴) |
| 7 | 1, 6 | mpanr1 437 | 1 ⊢ ((𝐴 ∈ ℝ* ∧ 0 ≤ 𝐴) → -∞ < 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2203 class class class wbr 4109 0cc0 8127 -∞cmnf 8306 ℝ*cxr 8307 < clt 8308 ≤ cle 8309 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2205 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 ax-pr 4322 ax-un 4554 ax-setind 4659 ax-cnex 8218 ax-resscn 8219 ax-1re 8221 ax-addrcl 8224 ax-rnegex 8236 ax-pre-ltirr 8239 ax-pre-ltwlin 8240 ax-pre-lttrn 8241 |
| This theorem depends on definitions: df-bi 117 df-3or 1006 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2083 df-mo 2084 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-ne 2413 df-nel 2508 df-ral 2525 df-rex 2526 df-rab 2529 df-v 2815 df-dif 3213 df-un 3215 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 df-pr 3696 df-op 3698 df-uni 3915 df-br 4110 df-opab 4172 df-po 4417 df-iso 4418 df-xp 4755 df-cnv 4757 df-pnf 8310 df-mnf 8311 df-xr 8312 df-ltxr 8313 df-le 8314 |
| This theorem is referenced by: ge0nemnf 10157 xrrege0 10158 pcgcd1 13026 |
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