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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 11136 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 3 | 2 | ltnri 11244 | . . . 4 ⊢ ¬ 0 < 0 |
| 4 | breq1 5101 | . . . 4 ⊢ (𝐴 = 0 → (𝐴 < 0 ↔ 0 < 0)) | |
| 5 | 3, 4 | mtbiri 327 | . . 3 ⊢ (𝐴 = 0 → ¬ 𝐴 < 0) |
| 6 | 5 | necon2ai 2961 | . 2 ⊢ (𝐴 < 0 → 𝐴 ≠ 0) |
| 7 | 1, 6 | syl 17 | 1 ⊢ (𝜑 → 𝐴 ≠ 0) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ≠ wne 2932 class class class wbr 5098 0cc0 11028 < clt 11168 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 ax-resscn 11085 ax-1cn 11086 ax-addrcl 11089 ax-rnegex 11099 ax-cnre 11101 ax-pre-lttri 11102 ax-pre-lttrn 11103 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 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 3061 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-po 5532 df-so 5533 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-er 8635 df-en 8886 df-dom 8887 df-sdom 8888 df-pnf 11170 df-mnf 11171 df-ltxr 11173 |
| This theorem is referenced by: nnne0 12181 mul2lt0rlt0 13011 mbfmulc2lem 25606 coseq00topi 26469 argimlt0 26580 atantan 26891 bcm1n 32877 sgnmul 32918 sgnsub 32920 sgn0bi 32923 sgnmulsgn 32925 cos9thpiminplylem1 33941 signsvfnn 34745 sn-nnne0 42736 sn-reclt0d 42757 mulltgt0d 42758 mullt0b1d 42759 mullt0b2d 42760 sn-mullt0d 42761 reclt0d 45652 requad1 47889 |
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