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| Mirrors > Home > MPE Home > Th. List > cnsqrt00 | Structured version Visualization version GIF version | ||
| Description: A square root of a complex number is zero iff its argument is 0. Version of sqrt00 15219 for complex numbers. (Contributed by AV, 26-Jan-2023.) |
| Ref | Expression |
|---|---|
| cnsqrt00 | ⊢ (𝐴 ∈ ℂ → ((√‘𝐴) = 0 ↔ 𝐴 = 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | oveq1 7366 | . . 3 ⊢ ((√‘𝐴) = 0 → ((√‘𝐴)↑2) = (0↑2)) | |
| 2 | sqrtth 15321 | . . . 4 ⊢ (𝐴 ∈ ℂ → ((√‘𝐴)↑2) = 𝐴) | |
| 3 | sq0 14148 | . . . . 5 ⊢ (0↑2) = 0 | |
| 4 | 3 | a1i 11 | . . . 4 ⊢ (𝐴 ∈ ℂ → (0↑2) = 0) |
| 5 | 2, 4 | eqeq12d 2752 | . . 3 ⊢ (𝐴 ∈ ℂ → (((√‘𝐴)↑2) = (0↑2) ↔ 𝐴 = 0)) |
| 6 | 1, 5 | imbitrid 245 | . 2 ⊢ (𝐴 ∈ ℂ → ((√‘𝐴) = 0 → 𝐴 = 0)) |
| 7 | fveq2 6830 | . . 3 ⊢ (𝐴 = 0 → (√‘𝐴) = (√‘0)) | |
| 8 | sqrt0 15197 | . . 3 ⊢ (√‘0) = 0 | |
| 9 | 7, 8 | eqtrdi 2787 | . 2 ⊢ (𝐴 = 0 → (√‘𝐴) = 0) |
| 10 | 6, 9 | impbid1 226 | 1 ⊢ (𝐴 ∈ ℂ → ((√‘𝐴) = 0 ↔ 𝐴 = 0)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 207 = wceq 1543 ∈ wcel 2115 ‘cfv 6488 (class class class)co 7359 ℂcc 11030 0cc0 11032 2c2 12230 ↑cexp 14017 √csqrt 15189 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1970 ax-7 2011 ax-8 2117 ax-9 2125 ax-10 2148 ax-11 2164 ax-12 2185 ax-ext 2708 ax-sep 5221 ax-nul 5231 ax-pow 5297 ax-pr 5365 ax-un 7681 ax-cnex 11088 ax-resscn 11089 ax-1cn 11090 ax-icn 11091 ax-addcl 11092 ax-addrcl 11093 ax-mulcl 11094 ax-mulrcl 11095 ax-mulcom 11096 ax-addass 11097 ax-mulass 11098 ax-distr 11099 ax-i2m1 11100 ax-1ne0 11101 ax-1rid 11102 ax-rnegex 11103 ax-rrecex 11104 ax-cnre 11105 ax-pre-lttri 11106 ax-pre-lttrn 11107 ax-pre-ltadd 11108 ax-pre-mulgt0 11109 ax-pre-sup 11110 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 850 df-3or 1089 df-3an 1090 df-tru 1546 df-fal 1556 df-ex 1783 df-nf 1787 df-sb 2070 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2932 df-nel 3036 df-ral 3051 df-rex 3061 df-rmo 3341 df-reu 3342 df-rab 3389 df-v 3430 df-sbc 3727 df-csb 3835 df-dif 3889 df-un 3891 df-in 3893 df-ss 3903 df-pss 3906 df-nul 4265 df-if 4458 df-pw 4534 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4842 df-iun 4926 df-br 5076 df-opab 5138 df-mpt 5157 df-tr 5183 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6255 df-ord 6316 df-on 6317 df-lim 6318 df-suc 6319 df-iota 6444 df-fun 6490 df-fn 6491 df-f 6492 df-f1 6493 df-fo 6494 df-f1o 6495 df-fv 6496 df-riota 7316 df-ov 7362 df-oprab 7363 df-mpo 7364 df-om 7810 df-2nd 7935 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-er 8636 df-en 8887 df-dom 8888 df-sdom 8889 df-sup 9348 df-pnf 11175 df-mnf 11176 df-xr 11177 df-ltxr 11178 df-le 11179 df-sub 11373 df-neg 11374 df-div 11802 df-nn 12169 df-2 12238 df-3 12239 df-n0 12432 df-z 12519 df-uz 12783 df-rp 12937 df-seq 13958 df-exp 14018 df-cj 15055 df-re 15056 df-im 15057 df-sqrt 15191 df-abs 15192 |
| This theorem is referenced by: iconstr 33953 sqrtcval 44082 quad1 48108 requad2 48111 |
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