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Mirrors > Home > MPE Home > Th. List > recval | Structured version Visualization version GIF version |
Description: Reciprocal expressed with a real denominator. (Contributed by Mario Carneiro, 1-Apr-2015.) |
Ref | Expression |
---|---|
recval | ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (1 / 𝐴) = ((∗‘𝐴) / ((abs‘𝐴)↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cjcl 14692 | . . . . . . 7 ⊢ (𝐴 ∈ ℂ → (∗‘𝐴) ∈ ℂ) | |
2 | 1 | adantr 484 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘𝐴) ∈ ℂ) |
3 | simpl 486 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → 𝐴 ∈ ℂ) | |
4 | 2, 3 | mulcomd 10878 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((∗‘𝐴) · 𝐴) = (𝐴 · (∗‘𝐴))) |
5 | absvalsq 14868 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴)↑2) = (𝐴 · (∗‘𝐴))) | |
6 | 5 | adantr 484 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((abs‘𝐴)↑2) = (𝐴 · (∗‘𝐴))) |
7 | 4, 6 | eqtr4d 2781 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((∗‘𝐴) · 𝐴) = ((abs‘𝐴)↑2)) |
8 | abscl 14866 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
9 | 8 | adantr 484 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℝ) |
10 | 9 | recnd 10885 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ∈ ℂ) |
11 | 10 | sqcld 13738 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((abs‘𝐴)↑2) ∈ ℂ) |
12 | cjne0 14750 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (𝐴 ≠ 0 ↔ (∗‘𝐴) ≠ 0)) | |
13 | 12 | biimpa 480 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (∗‘𝐴) ≠ 0) |
14 | 11, 2, 3, 13 | divmuld 11654 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((((abs‘𝐴)↑2) / (∗‘𝐴)) = 𝐴 ↔ ((∗‘𝐴) · 𝐴) = ((abs‘𝐴)↑2))) |
15 | 7, 14 | mpbird 260 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (((abs‘𝐴)↑2) / (∗‘𝐴)) = 𝐴) |
16 | 15 | oveq2d 7247 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (1 / (((abs‘𝐴)↑2) / (∗‘𝐴))) = (1 / 𝐴)) |
17 | abs00 14877 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) = 0 ↔ 𝐴 = 0)) | |
18 | 17 | necon3bid 2986 | . . . . 5 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) ≠ 0 ↔ 𝐴 ≠ 0)) |
19 | 18 | biimpar 481 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (abs‘𝐴) ≠ 0) |
20 | sqne0 13719 | . . . . 5 ⊢ ((abs‘𝐴) ∈ ℂ → (((abs‘𝐴)↑2) ≠ 0 ↔ (abs‘𝐴) ≠ 0)) | |
21 | 10, 20 | syl 17 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (((abs‘𝐴)↑2) ≠ 0 ↔ (abs‘𝐴) ≠ 0)) |
22 | 19, 21 | mpbird 260 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → ((abs‘𝐴)↑2) ≠ 0) |
23 | 11, 2, 22, 13 | recdivd 11649 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (1 / (((abs‘𝐴)↑2) / (∗‘𝐴))) = ((∗‘𝐴) / ((abs‘𝐴)↑2))) |
24 | 16, 23 | eqtr3d 2780 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 ≠ 0) → (1 / 𝐴) = ((∗‘𝐴) / ((abs‘𝐴)↑2))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1543 ∈ wcel 2111 ≠ wne 2941 ‘cfv 6397 (class class class)co 7231 ℂcc 10751 ℝcr 10752 0cc0 10753 1c1 10754 · cmul 10758 / cdiv 11513 2c2 11909 ↑cexp 13659 ∗ccj 14683 abscabs 14821 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2159 ax-12 2176 ax-ext 2709 ax-sep 5206 ax-nul 5213 ax-pow 5272 ax-pr 5336 ax-un 7541 ax-cnex 10809 ax-resscn 10810 ax-1cn 10811 ax-icn 10812 ax-addcl 10813 ax-addrcl 10814 ax-mulcl 10815 ax-mulrcl 10816 ax-mulcom 10817 ax-addass 10818 ax-mulass 10819 ax-distr 10820 ax-i2m1 10821 ax-1ne0 10822 ax-1rid 10823 ax-rnegex 10824 ax-rrecex 10825 ax-cnre 10826 ax-pre-lttri 10827 ax-pre-lttrn 10828 ax-pre-ltadd 10829 ax-pre-mulgt0 10830 ax-pre-sup 10831 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2072 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3067 df-rex 3068 df-reu 3069 df-rmo 3070 df-rab 3071 df-v 3422 df-sbc 3709 df-csb 3826 df-dif 3883 df-un 3885 df-in 3887 df-ss 3897 df-pss 3899 df-nul 4252 df-if 4454 df-pw 4529 df-sn 4556 df-pr 4558 df-tp 4560 df-op 4562 df-uni 4834 df-iun 4920 df-br 5068 df-opab 5130 df-mpt 5150 df-tr 5176 df-id 5469 df-eprel 5474 df-po 5482 df-so 5483 df-fr 5523 df-we 5525 df-xp 5571 df-rel 5572 df-cnv 5573 df-co 5574 df-dm 5575 df-rn 5576 df-res 5577 df-ima 5578 df-pred 6175 df-ord 6233 df-on 6234 df-lim 6235 df-suc 6236 df-iota 6355 df-fun 6399 df-fn 6400 df-f 6401 df-f1 6402 df-fo 6403 df-f1o 6404 df-fv 6405 df-riota 7188 df-ov 7234 df-oprab 7235 df-mpo 7236 df-om 7663 df-2nd 7780 df-wrecs 8067 df-recs 8128 df-rdg 8166 df-er 8411 df-en 8647 df-dom 8648 df-sdom 8649 df-sup 9082 df-pnf 10893 df-mnf 10894 df-xr 10895 df-ltxr 10896 df-le 10897 df-sub 11088 df-neg 11089 df-div 11514 df-nn 11855 df-2 11917 df-3 11918 df-n0 12115 df-z 12201 df-uz 12463 df-rp 12611 df-seq 13599 df-exp 13660 df-cj 14686 df-re 14687 df-im 14688 df-sqrt 14822 df-abs 14823 |
This theorem is referenced by: tanregt0 25452 root1cj 25666 lawcoslem1 25722 asinlem3 25778 sum2dchr 26179 |
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