| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 12979 | . . . 4 ⊢ ¬ 0 ∈ ℝ+ | |
| 2 | 0re 11146 | . . . . 5 ⊢ 0 ∈ ℝ | |
| 3 | logcn.d | . . . . . . 7 ⊢ 𝐷 = (ℂ ∖ (-∞(,]0)) | |
| 4 | 3 | ellogdm 26603 | . . . . . 6 ⊢ (0 ∈ 𝐷 ↔ (0 ∈ ℂ ∧ (0 ∈ ℝ → 0 ∈ ℝ+))) |
| 5 | 4 | simprbi 497 | . . . . 5 ⊢ (0 ∈ 𝐷 → (0 ∈ ℝ → 0 ∈ ℝ+)) |
| 6 | 2, 5 | mpi 20 | . . . 4 ⊢ (0 ∈ 𝐷 → 0 ∈ ℝ+) |
| 7 | 1, 6 | mto 197 | . . 3 ⊢ ¬ 0 ∈ 𝐷 |
| 8 | eleq1 2824 | . . 3 ⊢ (𝐴 = 0 → (𝐴 ∈ 𝐷 ↔ 0 ∈ 𝐷)) | |
| 9 | 7, 8 | mtbiri 327 | . 2 ⊢ (𝐴 = 0 → ¬ 𝐴 ∈ 𝐷) |
| 10 | 9 | necon2ai 2961 | 1 ⊢ (𝐴 ∈ 𝐷 → 𝐴 ≠ 0) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2114 ≠ wne 2932 ∖ cdif 3886 (class class class)co 7367 ℂcc 11036 ℝcr 11037 0cc0 11038 -∞cmnf 11177 ℝ+crp 12942 (,]cioc 13299 |
| 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 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-addrcl 11099 ax-rnegex 11109 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 |
| 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 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 3062 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-po 5539 df-so 5540 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-ov 7370 df-oprab 7371 df-mpo 7372 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-rp 12943 df-ioc 13303 |
| This theorem is referenced by: logdmss 26606 logcnlem2 26607 logcnlem3 26608 logcnlem4 26609 logcnlem5 26610 logcn 26611 dvloglem 26612 logf1o2 26614 logtayl 26624 logtayl2 26626 dvcncxp1 26707 dvcnsqrt 26708 cxpcn 26709 atansssdm 26897 lgamgulmlem2 26993 |
| Copyright terms: Public domain | W3C validator |