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| Mirrors > Home > MPE Home > Th. List > logdmn0 | Structured version Visualization version GIF version | ||
| Description: A number in the continuous domain of log is nonzero. (Contributed by Mario Carneiro, 18-Feb-2015.) |
| Ref | Expression |
|---|---|
| logcn.d | ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) |
| Ref | Expression |
|---|---|
| logdmn0 | ⊢ (𝐴 ∈ 𝐷 → 𝐴 ≠ 0) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nrp 13157 | . . . 4 ⊢ ¬ 0 ∈ ℝ+ | |
| 2 | 0re 11310 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 3 | logcn.d | . . . . . . 7 ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) | |
| 4 | 3 | ellogdm 26967 | . . . . . 6 ⊢ (0 ∈ 𝐷 ↔ (0 ∈ ℂ ∧ (0 ∈ ℝ → 0 ∈ ℝ+))) |
| 5 | 4 | simprbi 503 | . . . . 5 ⊢ (0 ∈ 𝐷 → (0 ∈ ℝ → 0 ∈ ℝ+)) |
| 6 | 2, 5 | mpi 21 | . . . 4 ⊢ (0 ∈ 𝐷 → 0 ∈ ℝ+) |
| 7 | 1, 6 | mto 200 | . . 3 ⊢ ¬ 0 ∈ 𝐷 |
| 8 | eleq1 2848 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ 𝐷 ↔ 0 ∈ 𝐷)) | |
| 9 | 7, 8 | mtbiri 330 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ 𝐷) |
| 10 | 9 | necon2ai 2984 | 1 ⊢ (𝐴 ∈ 𝐷 → 𝐴 ≠ 0) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 ∖ cdif 4045 (class class class)co 7420 ℂcc 11198 ℝcr 11199 0cc0 11200 -∞cmnf 11341 ℝ+crp 13120 (,]cioc 13477 |
| 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 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11256 ax-resscn 11257 ax-1cn 11258 ax-addrcl 11261 ax-rnegex 11271 ax-cnre 11273 ax-pre-lttri 11274 ax-pre-lttrn 11275 |
| 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 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5545 df-po 5558 df-so 5559 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-ov 7423 df-oprab 7424 df-mpo 7425 df-er 8717 df-en 8974 df-dom 8975 df-sdom 8976 df-pnf 11345 df-mnf 11346 df-xr 11347 df-ltxr 11348 df-le 11349 df-rp 13121 df-ioc 13481 |
| This theorem is used by: logdmss 26970 logcnlem2 26971 logcnlem3 26972 logcnlem4 26973 logcnlem5 26974 logcn 26975 dvloglem 26976 logf1o2 26978 logtayl 26988 logtayl2 26990 dvcncxp1 27071 dvcnsqrt 27072 cxpcn 27073 atansssdm 27261 lgamgulmlem2 27357 |
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