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| Mirrors > Home > MPE Home > Th. List > cjne0 | Structured version Visualization version GIF version | ||
| Description: A number is nonzero iff its complex conjugate is nonzero. (Contributed by NM, 29-Apr-2005.) |
| Ref | Expression |
|---|---|
| cjne0 | ⊢ (𝐴 ∈ ℂ → (𝐴 ≠ 0 ↔ (∗‘𝐴) ≠ 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0cn 11298 | . . . 4 ⊢ 0 ∈ ℂ | |
| 2 | cj11 15329 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 0 ∈ ℂ) → ((∗‘𝐴) = (∗‘0) ↔ 𝐴 = 0)) | |
| 3 | 1, 2 | mpan2 704 | . . 3 ⊢ (𝐴 ∈ ℂ → ((∗‘𝐴) = (∗‘0) ↔ 𝐴 = 0)) |
| 4 | cj0 15325 | . . . 4 ⊢ (∗‘0) = 0 | |
| 5 | 4 | eqeq2i 2774 | . . 3 ⊢ ((∗‘𝐴) = (∗‘0) ↔ (∗‘𝐴) = 0) |
| 6 | 3, 5 | bitr3di 289 | . 2 ⊢ (𝐴 ∈ ℂ → (𝐴 = 0 ↔ (∗‘𝐴) = 0)) |
| 7 | 6 | necon3bid 3000 | 1 ⊢ (𝐴 ∈ ℂ → (𝐴 ≠ 0 ↔ (∗‘𝐴) ≠ 0)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 = wceq 1570 ∈ wcel 2145 ≠ wne 2956 ‘cfv 6538 ℂcc 11198 0cc0 11200 ∗ccj 15263 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7751 ax-resscn 11257 ax-1cn 11258 ax-icn 11259 ax-addcl 11260 ax-addrcl 11261 ax-mulcl 11262 ax-mulrcl 11263 ax-mulcom 11264 ax-addass 11265 ax-mulass 11266 ax-distr 11267 ax-i2m1 11268 ax-1ne0 11269 ax-1rid 11270 ax-rnegex 11271 ax-rrecex 11272 ax-cnre 11273 ax-pre-lttri 11274 ax-pre-lttrn 11275 ax-pre-ltadd 11276 ax-pre-mulgt0 11277 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 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-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-frecs 8299 df-wrecs 8330 df-recs 8379 df-rdg 8418 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-sub 11543 df-neg 11544 df-div 11974 df-nn 12336 df-2 12405 df-cj 15266 df-re 15267 df-im 15268 |
| This theorem is used by: cjdiv 15331 cjne0d 15370 recval 15490 logcj 26934 |
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