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Mirrors > Home > MPE Home > Th. List > mulneg1 | Structured version Visualization version GIF version |
Description: Product with negative is negative of product. Theorem I.12 of [Apostol] p. 18. (Contributed by NM, 14-May-1999.) (Proof shortened by Mario Carneiro, 27-May-2016.) |
Ref | Expression |
---|---|
mulneg1 | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 · 𝐵) = -(𝐴 · 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0cn 10790 | . . . 4 ⊢ 0 ∈ ℂ | |
2 | subdir 11231 | . . . 4 ⊢ ((0 ∈ ℂ ∧ 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐴) · 𝐵) = ((0 · 𝐵) − (𝐴 · 𝐵))) | |
3 | 1, 2 | mp3an1 1450 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐴) · 𝐵) = ((0 · 𝐵) − (𝐴 · 𝐵))) |
4 | simpr 488 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → 𝐵 ∈ ℂ) | |
5 | 4 | mul02d 10995 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (0 · 𝐵) = 0) |
6 | 5 | oveq1d 7206 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 · 𝐵) − (𝐴 · 𝐵)) = (0 − (𝐴 · 𝐵))) |
7 | 3, 6 | eqtrd 2771 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐴) · 𝐵) = (0 − (𝐴 · 𝐵))) |
8 | df-neg 11030 | . . 3 ⊢ -𝐴 = (0 − 𝐴) | |
9 | 8 | oveq1i 7201 | . 2 ⊢ (-𝐴 · 𝐵) = ((0 − 𝐴) · 𝐵) |
10 | df-neg 11030 | . 2 ⊢ -(𝐴 · 𝐵) = (0 − (𝐴 · 𝐵)) | |
11 | 7, 9, 10 | 3eqtr4g 2796 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 · 𝐵) = -(𝐴 · 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2112 (class class class)co 7191 ℂcc 10692 0cc0 10694 · cmul 10699 − cmin 11027 -cneg 11028 |
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 |
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-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-ltxr 10837 df-sub 11029 df-neg 11030 |
This theorem is referenced by: mulneg2 11234 mulneg12 11235 mulm1 11238 mulneg1i 11243 mulneg1d 11250 divneg 11489 zmulcl 12191 modcyc2 13445 cjreim 14688 tanval3 15658 dvdsnegb 15798 odd2np1 15865 modgcd 16055 pcexp 16375 cnfldmulg 20349 sinperlem 25324 sineq0 25367 efeq1 25371 asinlem3a 25707 atancj 25747 atantayl 25774 atantayl2 25775 zetacvg 25851 basellem3 25919 basellem9 25925 ipval2 28742 ipasslem2 28867 itg2addnclem3 35516 ftc1anclem6 35541 stoweidlem10 43169 |
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