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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 9926 | . 2 ⊢ -∞ < 0 | |
| 2 | mnfxr 8149 | . . . 4 ⊢ -∞ ∈ ℝ* | |
| 3 | 0xr 8139 | . . . 4 ⊢ 0 ∈ ℝ* | |
| 4 | xrltletr 9949 | . . . 4 ⊢ ((-∞ ∈ ℝ* ∧ 0 ∈ ℝ* ∧ 𝐴 ∈ ℝ*) → ((-∞ < 0 ∧ 0 ≤ 𝐴) → -∞ < 𝐴)) | |
| 5 | 2, 3, 4 | mp3an12 1340 | . . 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 2177 class class class wbr 4051 0cc0 7945 -∞cmnf 8125 ℝ*cxr 8126 < clt 8127 ≤ cle 8128 |
| 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 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4170 ax-pow 4226 ax-pr 4261 ax-un 4488 ax-setind 4593 ax-cnex 8036 ax-resscn 8037 ax-1re 8039 ax-addrcl 8042 ax-rnegex 8054 ax-pre-ltirr 8057 ax-pre-ltwlin 8058 ax-pre-lttrn 8059 |
| This theorem depends on definitions: df-bi 117 df-3or 982 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-nel 2473 df-ral 2490 df-rex 2491 df-rab 2494 df-v 2775 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-pw 3623 df-sn 3644 df-pr 3645 df-op 3647 df-uni 3857 df-br 4052 df-opab 4114 df-po 4351 df-iso 4352 df-xp 4689 df-cnv 4691 df-pnf 8129 df-mnf 8130 df-xr 8131 df-ltxr 8132 df-le 8133 |
| This theorem is referenced by: ge0nemnf 9966 xrrege0 9967 pcgcd1 12726 |
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