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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 11212 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 3 | 2 | ltnri 11321 | . . . 4 ⊢ ¬ 0 < 0 |
| 4 | breq1 5116 | . . . 4 ⊢ (𝐴 = 0 → (𝐴 < 0 ↔ 0 < 0)) | |
| 5 | 3, 4 | mtbiri 330 | . . 3 ⊢ (𝐴 = 0 → ¬ 𝐴 < 0) |
| 6 | 5 | necon2ai 2993 | . 2 ⊢ (𝐴 < 0 → 𝐴 ≠ 0) |
| 7 | 1, 6 | syl 18 | 1 ⊢ (𝜑 → 𝐴 ≠ 0) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1567 ≠ wne 2964 class class class wbr 5113 0cc0 11102 < clt 11245 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5261 ax-nul 5273 ax-pow 5339 ax-pr 5407 ax-un 7735 ax-resscn 11159 ax-1cn 11160 ax-addrcl 11163 ax-rnegex 11173 ax-cnre 11175 ax-pre-lttri 11176 ax-pre-lttrn 11177 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4877 df-br 5114 df-opab 5178 df-mpt 5197 df-id 5559 df-po 5572 df-so 5573 df-xp 5670 df-rel 5671 df-cnv 5672 df-co 5673 df-dm 5674 df-rn 5675 df-res 5676 df-ima 5677 df-iota 6495 df-fun 6541 df-fn 6542 df-f 6543 df-f1 6544 df-fo 6545 df-f1o 6546 df-fv 6547 df-er 8696 df-en 8946 df-dom 8947 df-sdom 8948 df-pnf 11247 df-mnf 11248 df-ltxr 11250 |
| This theorem is referenced by: nnne0 12272 mul2lt0rlt0 13122 sgn0bi 15142 sgnsub 15145 sgnmul 15146 sgnmulsgn 15148 mbfmulc2lem 25777 coseq00topi 26635 argimlt0 26746 atantan 27056 bcm1n 33083 cos9thpiminplylem1 34119 signsvfnn 34920 sn-nnne0 43161 sn-reclt0d 43182 mulltgt0d 43183 mullt0b1d 43184 mullt0b2d 43185 sn-mullt0d 43186 reclt0d 46031 requad1 48313 |
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