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Mirrors > Home > MPE Home > Th. List > absneg | Structured version Visualization version GIF version |
Description: Absolute value of the opposite. (Contributed by NM, 27-Feb-2005.) |
Ref | Expression |
---|---|
absneg | ⊢ (𝐴 ∈ ℂ → (abs‘-𝐴) = (abs‘𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cjneg 14675 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (∗‘-𝐴) = -(∗‘𝐴)) | |
2 | 1 | oveq2d 7207 | . . . 4 ⊢ (𝐴 ∈ ℂ → (-𝐴 · (∗‘-𝐴)) = (-𝐴 · -(∗‘𝐴))) |
3 | cjcl 14633 | . . . . 5 ⊢ (𝐴 ∈ ℂ → (∗‘𝐴) ∈ ℂ) | |
4 | mul2neg 11236 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ (∗‘𝐴) ∈ ℂ) → (-𝐴 · -(∗‘𝐴)) = (𝐴 · (∗‘𝐴))) | |
5 | 3, 4 | mpdan 687 | . . . 4 ⊢ (𝐴 ∈ ℂ → (-𝐴 · -(∗‘𝐴)) = (𝐴 · (∗‘𝐴))) |
6 | 2, 5 | eqtrd 2771 | . . 3 ⊢ (𝐴 ∈ ℂ → (-𝐴 · (∗‘-𝐴)) = (𝐴 · (∗‘𝐴))) |
7 | 6 | fveq2d 6699 | . 2 ⊢ (𝐴 ∈ ℂ → (√‘(-𝐴 · (∗‘-𝐴))) = (√‘(𝐴 · (∗‘𝐴)))) |
8 | negcl 11043 | . . 3 ⊢ (𝐴 ∈ ℂ → -𝐴 ∈ ℂ) | |
9 | absval 14766 | . . 3 ⊢ (-𝐴 ∈ ℂ → (abs‘-𝐴) = (√‘(-𝐴 · (∗‘-𝐴)))) | |
10 | 8, 9 | syl 17 | . 2 ⊢ (𝐴 ∈ ℂ → (abs‘-𝐴) = (√‘(-𝐴 · (∗‘-𝐴)))) |
11 | absval 14766 | . 2 ⊢ (𝐴 ∈ ℂ → (abs‘𝐴) = (√‘(𝐴 · (∗‘𝐴)))) | |
12 | 7, 10, 11 | 3eqtr4d 2781 | 1 ⊢ (𝐴 ∈ ℂ → (abs‘-𝐴) = (abs‘𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1543 ∈ wcel 2112 ‘cfv 6358 (class class class)co 7191 ℂcc 10692 · cmul 10699 -cneg 11028 ∗ccj 14624 √csqrt 14761 abscabs 14762 |
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 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 ax-resscn 10751 ax-1cn 10752 ax-icn 10753 ax-addcl 10754 ax-addrcl 10755 ax-mulcl 10756 ax-mulrcl 10757 ax-mulcom 10758 ax-addass 10759 ax-mulass 10760 ax-distr 10761 ax-i2m1 10762 ax-1ne0 10763 ax-1rid 10764 ax-rnegex 10765 ax-rrecex 10766 ax-cnre 10767 ax-pre-lttri 10768 ax-pre-lttrn 10769 ax-pre-ltadd 10770 ax-pre-mulgt0 10771 |
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 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-br 5040 df-opab 5102 df-mpt 5121 df-id 5440 df-po 5453 df-so 5454 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7148 df-ov 7194 df-oprab 7195 df-mpo 7196 df-er 8369 df-en 8605 df-dom 8606 df-sdom 8607 df-pnf 10834 df-mnf 10835 df-xr 10836 df-ltxr 10837 df-le 10838 df-sub 11029 df-neg 11030 df-div 11455 df-2 11858 df-cj 14627 df-re 14628 df-im 14629 df-abs 14764 |
This theorem is referenced by: absnid 14827 absimle 14838 abslt 14843 absle 14844 abssub 14855 abs2dif2 14862 sqreulem 14888 absnegi 14929 absnegd 14978 cnheibor 23806 ftalem3 25911 qqhcn 31607 jm2.26lem3 40467 sqrtcvallem4 40864 |
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