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Mirrors > Home > ILE Home > Th. List > recvalap | GIF version |
Description: Reciprocal expressed with a real denominator. (Contributed by Jim Kingdon, 13-Aug-2021.) |
Ref | Expression |
---|---|
recvalap | ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (1 / 𝐴) = ((∗‘𝐴) / ((abs‘𝐴)↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cjcl 10613 | . . . . . . 7 ⊢ (𝐴 ∈ ℂ → (∗‘𝐴) ∈ ℂ) | |
2 | 1 | adantr 274 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (∗‘𝐴) ∈ ℂ) |
3 | simpl 108 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → 𝐴 ∈ ℂ) | |
4 | 2, 3 | mulcomd 7780 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → ((∗‘𝐴) · 𝐴) = (𝐴 · (∗‘𝐴))) |
5 | absvalsq 10818 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴)↑2) = (𝐴 · (∗‘𝐴))) | |
6 | 5 | adantr 274 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → ((abs‘𝐴)↑2) = (𝐴 · (∗‘𝐴))) |
7 | 4, 6 | eqtr4d 2173 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → ((∗‘𝐴) · 𝐴) = ((abs‘𝐴)↑2)) |
8 | abscl 10816 | . . . . . . . 8 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) ∈ ℝ) | |
9 | 8 | adantr 274 | . . . . . . 7 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (abs‘𝐴) ∈ ℝ) |
10 | 9 | recnd 7787 | . . . . . 6 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (abs‘𝐴) ∈ ℂ) |
11 | 10 | sqcld 10415 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → ((abs‘𝐴)↑2) ∈ ℂ) |
12 | cjap0 10672 | . . . . . 6 ⊢ (𝐴 ∈ ℂ → (𝐴 # 0 ↔ (∗‘𝐴) # 0)) | |
13 | 12 | biimpa 294 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (∗‘𝐴) # 0) |
14 | 11, 2, 3, 13 | divmulapd 8565 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → ((((abs‘𝐴)↑2) / (∗‘𝐴)) = 𝐴 ↔ ((∗‘𝐴) · 𝐴) = ((abs‘𝐴)↑2))) |
15 | 7, 14 | mpbird 166 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (((abs‘𝐴)↑2) / (∗‘𝐴)) = 𝐴) |
16 | 15 | oveq2d 5783 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (1 / (((abs‘𝐴)↑2) / (∗‘𝐴))) = (1 / 𝐴)) |
17 | abs00ap 10827 | . . . . 5 ⊢ (𝐴 ∈ ℂ → ((abs‘𝐴) # 0 ↔ 𝐴 # 0)) | |
18 | 17 | biimpar 295 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (abs‘𝐴) # 0) |
19 | sqap0 10352 | . . . . 5 ⊢ ((abs‘𝐴) ∈ ℂ → (((abs‘𝐴)↑2) # 0 ↔ (abs‘𝐴) # 0)) | |
20 | 10, 19 | syl 14 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (((abs‘𝐴)↑2) # 0 ↔ (abs‘𝐴) # 0)) |
21 | 18, 20 | mpbird 166 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → ((abs‘𝐴)↑2) # 0) |
22 | 11, 2, 21, 13 | recdivapd 8560 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (1 / (((abs‘𝐴)↑2) / (∗‘𝐴))) = ((∗‘𝐴) / ((abs‘𝐴)↑2))) |
23 | 16, 22 | eqtr3d 2172 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐴 # 0) → (1 / 𝐴) = ((∗‘𝐴) / ((abs‘𝐴)↑2))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1331 ∈ wcel 1480 class class class wbr 3924 ‘cfv 5118 (class class class)co 5767 ℂcc 7611 ℝcr 7612 0cc0 7613 1c1 7614 · cmul 7618 # cap 8336 / cdiv 8425 2c2 8764 ↑cexp 10285 ∗ccj 10604 abscabs 10762 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-coll 4038 ax-sep 4041 ax-nul 4049 ax-pow 4093 ax-pr 4126 ax-un 4350 ax-setind 4447 ax-iinf 4497 ax-cnex 7704 ax-resscn 7705 ax-1cn 7706 ax-1re 7707 ax-icn 7708 ax-addcl 7709 ax-addrcl 7710 ax-mulcl 7711 ax-mulrcl 7712 ax-addcom 7713 ax-mulcom 7714 ax-addass 7715 ax-mulass 7716 ax-distr 7717 ax-i2m1 7718 ax-0lt1 7719 ax-1rid 7720 ax-0id 7721 ax-rnegex 7722 ax-precex 7723 ax-cnre 7724 ax-pre-ltirr 7725 ax-pre-ltwlin 7726 ax-pre-lttrn 7727 ax-pre-apti 7728 ax-pre-ltadd 7729 ax-pre-mulgt0 7730 ax-pre-mulext 7731 ax-arch 7732 ax-caucvg 7733 |
This theorem depends on definitions: df-bi 116 df-dc 820 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2000 df-mo 2001 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-nel 2402 df-ral 2419 df-rex 2420 df-reu 2421 df-rmo 2422 df-rab 2423 df-v 2683 df-sbc 2905 df-csb 2999 df-dif 3068 df-un 3070 df-in 3072 df-ss 3079 df-nul 3359 df-if 3470 df-pw 3507 df-sn 3528 df-pr 3529 df-op 3531 df-uni 3732 df-int 3767 df-iun 3810 df-br 3925 df-opab 3985 df-mpt 3986 df-tr 4022 df-id 4210 df-po 4213 df-iso 4214 df-iord 4283 df-on 4285 df-ilim 4286 df-suc 4288 df-iom 4500 df-xp 4540 df-rel 4541 df-cnv 4542 df-co 4543 df-dm 4544 df-rn 4545 df-res 4546 df-ima 4547 df-iota 5083 df-fun 5120 df-fn 5121 df-f 5122 df-f1 5123 df-fo 5124 df-f1o 5125 df-fv 5126 df-riota 5723 df-ov 5770 df-oprab 5771 df-mpo 5772 df-1st 6031 df-2nd 6032 df-recs 6195 df-frec 6281 df-pnf 7795 df-mnf 7796 df-xr 7797 df-ltxr 7798 df-le 7799 df-sub 7928 df-neg 7929 df-reap 8330 df-ap 8337 df-div 8426 df-inn 8714 df-2 8772 df-3 8773 df-4 8774 df-n0 8971 df-z 9048 df-uz 9320 df-rp 9435 df-seqfrec 10212 df-exp 10286 df-cj 10607 df-re 10608 df-im 10609 df-rsqrt 10763 df-abs 10764 |
This theorem is referenced by: (None) |
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