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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 11140 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 3 | 2 | ltnri 11249 | . . . 4 ⊢ ¬ 0 < 0 |
| 4 | breq1 5089 | . . . 4 ⊢ (𝐴 = 0 → (𝐴 < 0 ↔ 0 < 0)) | |
| 5 | 3, 4 | mtbiri 327 | . . 3 ⊢ (𝐴 = 0 → ¬ 𝐴 < 0) |
| 6 | 5 | necon2ai 2962 | . 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 1542 ≠ wne 2933 class class class wbr 5086 0cc0 11032 < clt 11173 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pow 5303 ax-pr 5371 ax-un 7683 ax-resscn 11089 ax-1cn 11090 ax-addrcl 11093 ax-rnegex 11103 ax-cnre 11105 ax-pre-lttri 11106 ax-pre-lttrn 11107 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5520 df-po 5533 df-so 5534 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-er 8637 df-en 8888 df-dom 8889 df-sdom 8890 df-pnf 11175 df-mnf 11176 df-ltxr 11178 |
| This theorem is referenced by: nnne0 12205 mul2lt0rlt0 13040 mbfmulc2lem 25627 coseq00topi 26482 argimlt0 26593 atantan 26903 bcm1n 32886 sgnmul 32926 sgnsub 32928 sgn0bi 32931 sgnmulsgn 32933 cos9thpiminplylem1 33945 signsvfnn 34749 sn-nnne0 42922 sn-reclt0d 42943 mulltgt0d 42944 mullt0b1d 42945 mullt0b2d 42946 sn-mullt0d 42947 reclt0d 45837 requad1 48113 |
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