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Mirrors > Home > MPE Home > Th. List > abslem2 | Structured version Visualization version GIF version |
Description: Lemma involving absolute values. (Contributed by NM, 11-Oct-1999.) (Revised by Mario Carneiro, 29-May-2016.) |
Ref | Expression |
---|---|
abslem2 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (((∗‘(𝐴 / (abs‘𝐴))) · 𝐴) + ((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) = (2 · (abs‘𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | absvalsq 14920 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴)↑2) = (𝐴 · (∗‘𝐴))) | |
2 | 1 | adantr 480 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((abs‘𝐴)↑2) = (𝐴 · (∗‘𝐴))) |
3 | abscl 14918 | . . . . . . . . . . 11 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
4 | 3 | adantr 480 | . . . . . . . . . 10 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ) |
5 | 4 | recnd 10934 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℂ) |
6 | 5 | sqvald 13789 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((abs‘𝐴)↑2) = ((abs‘𝐴) · (abs‘𝐴))) |
7 | 2, 6 | eqtr3d 2780 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (𝐴 · (∗‘𝐴)) = ((abs‘𝐴) · (abs‘𝐴))) |
8 | 7 | oveq1d 7270 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((𝐴 · (∗‘𝐴)) / (abs‘𝐴)) = (((abs‘𝐴) · (abs‘𝐴)) / (abs‘𝐴))) |
9 | simpl 482 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → 𝐴 ∈ ℂ) | |
10 | 9 | cjcld 14835 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘𝐴) ∈ ℂ) |
11 | abs00 14929 | . . . . . . . . 9 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) = 0 ↔ 𝐴 = 0)) | |
12 | 11 | necon3bid 2987 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) ≠ 0 ↔ 𝐴 ≠ 0)) |
13 | 12 | biimpar 477 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ≠ 0) |
14 | 9, 10, 5, 13 | div23d 11718 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((𝐴 · (∗‘𝐴)) / (abs‘𝐴)) = ((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) |
15 | 5, 5, 13 | divcan3d 11686 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (((abs‘𝐴) · (abs‘𝐴)) / (abs‘𝐴)) = (abs‘𝐴)) |
16 | 8, 14, 15 | 3eqtr3d 2786 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((𝐴 / (abs‘𝐴)) · (∗‘𝐴)) = (abs‘𝐴)) |
17 | 16 | fveq2d 6760 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) = (∗‘(abs‘𝐴))) |
18 | 9, 5, 13 | divcld 11681 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (𝐴 / (abs‘𝐴)) ∈ ℂ) |
19 | 18, 10 | cjmuld 14860 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) = ((∗‘(𝐴 / (abs‘𝐴))) · (∗‘(∗‘𝐴)))) |
20 | 9 | cjcjd 14838 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘(∗‘𝐴)) = 𝐴) |
21 | 20 | oveq2d 7271 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((∗‘(𝐴 / (abs‘𝐴))) · (∗‘(∗‘𝐴))) = ((∗‘(𝐴 / (abs‘𝐴))) · 𝐴)) |
22 | 19, 21 | eqtrd 2778 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) = ((∗‘(𝐴 / (abs‘𝐴))) · 𝐴)) |
23 | 4 | cjred 14865 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘(abs‘𝐴)) = (abs‘𝐴)) |
24 | 17, 22, 23 | 3eqtr3d 2786 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((∗‘(𝐴 / (abs‘𝐴))) · 𝐴) = (abs‘𝐴)) |
25 | 24, 16 | oveq12d 7273 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (((∗‘(𝐴 / (abs‘𝐴))) · 𝐴) + ((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) = ((abs‘𝐴) + (abs‘𝐴))) |
26 | 5 | 2timesd 12146 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (2 · (abs‘𝐴)) = ((abs‘𝐴) + (abs‘𝐴))) |
27 | 25, 26 | eqtr4d 2781 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (((∗‘(𝐴 / (abs‘𝐴))) · 𝐴) + ((𝐴 / (abs‘𝐴)) · (∗‘𝐴))) = (2 · (abs‘𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ‘cfv 6418 (class class class)co 7255 ℂcc 10800 ℝcr 10801 0cc0 10802 + caddc 10805 · cmul 10807 / cdiv 11562 2c2 11958 ↑cexp 13710 ∗ccj 14735 abscabs 14873 |
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-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 |
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-reu 3070 df-rmo 3071 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-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 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-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 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-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-sup 9131 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-n0 12164 df-z 12250 df-uz 12512 df-rp 12660 df-seq 13650 df-exp 13711 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 |
This theorem is referenced by: bcsiALT 29442 |
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