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| Mirrors > Home > MPE Home > Th. List > lt0ne0d | Structured version Visualization version GIF version | ||
| Description: Something less than zero is not zero. Deduction form. (Contributed by David Moews, 28-Feb-2017.) |
| Ref | Expression |
|---|---|
| lt0ne0d.1 | ⊢ (𝜑 → 𝐴 < 0) |
| Ref | Expression |
|---|---|
| lt0ne0d | ⊢ (𝜑 → 𝐴 ≠ 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | lt0ne0d.1 | . 2 ⊢ (𝜑 → 𝐴 < 0) | |
| 2 | 0re 11320 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 3 | 2 | ltnri 11429 | . . . 4 ⊢ ¬ 0 < 0 |
| 4 | breq1 5108 | . . . 4 ⊢ (𝐴 = 0 → (𝐴 < 0 ↔ 0 < 0)) | |
| 5 | 3, 4 | mtbiri 330 | . . 3 ⊢ (𝐴 = 0 → ¬ 𝐴 < 0) |
| 6 | 5 | necon2ai 2987 | . 2 ⊢ (𝐴 < 0 → 𝐴 ≠ 0) |
| 7 | 1, 6 | syl 18 | 1 ⊢ (𝜑 → 𝐴 ≠ 0) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ≠ wne 2958 class class class wbr 5105 0cc0 11210 < clt 11353 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5251 ax-nul 5262 ax-pow 5330 ax-pr 5394 ax-un 7758 ax-resscn 11267 ax-1cn 11268 ax-addrcl 11271 ax-rnegex 11281 ax-cnre 11283 ax-pre-lttri 11284 ax-pre-lttrn 11285 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-nel 3065 df-ral 3080 df-rex 3090 df-rab 3416 df-v 3455 df-sbc 3742 df-csb 3851 df-ss 3900 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-br 5106 df-opab 5170 df-mpt 5189 df-id 5549 df-po 5562 df-so 5563 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-iota 6500 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-fv 6554 df-er 8728 df-en 8985 df-dom 8986 df-sdom 8987 df-pnf 11355 df-mnf 11356 df-ltxr 11358 |
| This theorem is used by: nnne0 12382 mul2lt0rlt0 13234 sgn0bi 15268 sgnsub 15271 sgnmul 15272 sgnmulsgn 15274 mbfmulc2lem 25980 coseq00topi 26843 argimlt0 26953 atantan 27263 bcm1n 33440 cos9thpiminplylem1 34467 signsvfnn 35268 sn-nnne0 43664 sn-reclt0d 43685 mulltgt0d 43686 mullt0b1d 43687 mullt0b2d 43688 sn-mullt0d 43689 reclt0d 46537 requad1 48859 |
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