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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 12694 | . . . 4 ⊢ ¬ 0 ∈ ℝ+ | |
2 | 0re 10908 | . . . . 5 ⊢ 0 ∈ ℝ | |
3 | logcn.d | . . . . . . 7 ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) | |
4 | 3 | ellogdm 25699 | . . . . . 6 ⊢ (0 ∈ 𝐷 ↔ (0 ∈ ℂ ∧ (0 ∈ ℝ → 0 ∈ ℝ+))) |
5 | 4 | simprbi 496 | . . . . 5 ⊢ (0 ∈ 𝐷 → (0 ∈ ℝ → 0 ∈ ℝ+)) |
6 | 2, 5 | mpi 20 | . . . 4 ⊢ (0 ∈ 𝐷 → 0 ∈ ℝ+) |
7 | 1, 6 | mto 196 | . . 3 ⊢ ¬ 0 ∈ 𝐷 |
8 | eleq1 2826 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ 𝐷 ↔ 0 ∈ 𝐷)) | |
9 | 7, 8 | mtbiri 326 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ 𝐷) |
10 | 9 | necon2ai 2972 | 1 ⊢ (𝐴 ∈ 𝐷 → 𝐴 ≠ 0) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ∖ cdif 3880 (class class class)co 7255 ℂcc 10800 ℝcr 10801 0cc0 10802 -∞cmnf 10938 ℝ+crp 12659 (,]cioc 13009 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-addrcl 10863 ax-rnegex 10873 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-po 5494 df-so 5495 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-ov 7258 df-oprab 7259 df-mpo 7260 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-rp 12660 df-ioc 13013 |
This theorem is referenced by: logdmss 25702 logcnlem2 25703 logcnlem3 25704 logcnlem4 25705 logcnlem5 25706 logcn 25707 dvloglem 25708 logf1o2 25710 logtayl 25720 logtayl2 25722 dvcncxp1 25801 dvcnsqrt 25802 cxpcn 25803 atansssdm 25988 lgamgulmlem2 26084 |
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