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Mirrors > Home > MPE Home > Th. List > cjmulrcl | Structured version Visualization version GIF version |
Description: A complex number times its conjugate is real. (Contributed by NM, 26-Mar-2005.) (Revised by Mario Carneiro, 14-Jul-2014.) |
Ref | Expression |
---|---|
cjmulrcl | ⊢ (𝐴 ∈ ℂ → (𝐴 · (∗‘𝐴)) ∈ ℝ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cjcj 14501 | . . . 4 ⊢ (𝐴 ∈ ℂ → (∗‘(∗‘𝐴)) = 𝐴) | |
2 | 1 | oveq2d 7174 | . . 3 ⊢ (𝐴 ∈ ℂ → ((∗‘𝐴) · (∗‘(∗‘𝐴))) = ((∗‘𝐴) · 𝐴)) |
3 | cjcl 14466 | . . . 4 ⊢ (𝐴 ∈ ℂ → (∗‘𝐴) ∈ ℂ) | |
4 | cjmul 14503 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (∗‘(𝐴 · (∗‘𝐴))) = ((∗‘𝐴) · (∗‘(∗‘𝐴)))) | |
5 | 3, 4 | mpdan 685 | . . 3 ⊢ (𝐴 ∈ ℂ → (∗‘(𝐴 · (∗‘𝐴))) = ((∗‘𝐴) · (∗‘(∗‘𝐴)))) |
6 | mulcom 10625 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (𝐴 · (∗‘𝐴)) = ((∗‘𝐴) · 𝐴)) | |
7 | 3, 6 | mpdan 685 | . . 3 ⊢ (𝐴 ∈ ℂ → (𝐴 · (∗‘𝐴)) = ((∗‘𝐴) · 𝐴)) |
8 | 2, 5, 7 | 3eqtr4d 2868 | . 2 ⊢ (𝐴 ∈ ℂ → (∗‘(𝐴 · (∗‘𝐴))) = (𝐴 · (∗‘𝐴))) |
9 | mulcl 10623 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (𝐴 · (∗‘𝐴)) ∈ ℂ) | |
10 | 3, 9 | mpdan 685 | . . 3 ⊢ (𝐴 ∈ ℂ → (𝐴 · (∗‘𝐴)) ∈ ℂ) |
11 | cjreb 14484 | . . 3 ⊢ ((𝐴 · (∗‘𝐴)) ∈ ℂ → ((𝐴 · (∗‘𝐴)) ∈ ℝ ↔ (∗‘(𝐴 · (∗‘𝐴))) = (𝐴 · (∗‘𝐴)))) | |
12 | 10, 11 | syl 17 | . 2 ⊢ (𝐴 ∈ ℂ → ((𝐴 · (∗‘𝐴)) ∈ ℝ ↔ (∗‘(𝐴 · (∗‘𝐴))) = (𝐴 · (∗‘𝐴)))) |
13 | 8, 12 | mpbird 259 | 1 ⊢ (𝐴 ∈ ℂ → (𝐴 · (∗‘𝐴)) ∈ ℝ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 = wceq 1537 ∈ wcel 2114 ‘cfv 6357 (class class class)co 7158 ℂcc 10537 ℝcr 10538 · cmul 10544 ∗ccj 14457 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615 ax-pre-mulgt0 10616 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rmo 3148 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-po 5476 df-so 5477 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-div 11300 df-2 11703 df-cj 14460 df-re 14461 df-im 14462 |
This theorem is referenced by: cjmulval 14506 cjmulrcli 14538 cjmulrcld 14567 abscl 14640 absvalsq 14642 absge0 14649 absmul 14656 absfico 41488 sigarid 43122 |
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