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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 11291 | . . . 4 ⊢ 0 ∈ ℂ | |
| 2 | subdir 11743 | . . . 4 ⊢ ((0 ∈ ℂ ∧ 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐴) · 𝐵) = ((0 · 𝐵) − (𝐴 · 𝐵))) | |
| 3 | 1, 2 | mp3an1 1477 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐴) · 𝐵) = ((0 · 𝐵) − (𝐴 · 𝐵))) |
| 4 | simpr 490 | . . . . 5 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → 𝐵 ∈ ℂ) | |
| 5 | 4 | mul02d 11501 | . . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (0 · 𝐵) = 0) |
| 6 | 5 | oveq1d 7433 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 · 𝐵) − (𝐴 · 𝐵)) = (0 − (𝐴 · 𝐵))) |
| 7 | 3, 6 | eqtrd 2796 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → ((0 − 𝐴) · 𝐵) = (0 − (𝐴 · 𝐵))) |
| 8 | df-neg 11537 | . . 3 ⊢ -𝐴 = (0 − 𝐴) | |
| 9 | 8 | oveq1i 7428 | . 2 ⊢ (-𝐴 · 𝐵) = ((0 − 𝐴) · 𝐵) |
| 10 | df-neg 11537 | . 2 ⊢ -(𝐴 · 𝐵) = (0 − (𝐴 · 𝐵)) | |
| 11 | 7, 9, 10 | 3eqtr4g 2821 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (-𝐴 · 𝐵) = -(𝐴 · 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 (class class class)co 7418 ℂcc 11191 0cc0 11193 · cmul 11198 − cmin 11534 -cneg 11535 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7749 ax-resscn 11250 ax-1cn 11251 ax-icn 11252 ax-addcl 11253 ax-addrcl 11254 ax-mulcl 11255 ax-mulrcl 11256 ax-mulcom 11257 ax-addass 11258 ax-mulass 11259 ax-distr 11260 ax-i2m1 11261 ax-1ne0 11262 ax-1rid 11263 ax-rnegex 11264 ax-rrecex 11265 ax-cnre 11266 ax-pre-lttri 11267 ax-pre-lttrn 11268 ax-pre-ltadd 11269 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3063 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-po 5559 df-so 5560 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7375 df-ov 7421 df-oprab 7422 df-mpo 7423 df-er 8710 df-en 8967 df-dom 8968 df-sdom 8969 df-pnf 11338 df-mnf 11339 df-ltxr 11341 df-sub 11536 df-neg 11537 |
| This theorem is used by: mulneg2 11746 mulneg12 11747 mulm1 11750 mulneg1i 11755 mulneg1d 11762 divneg 12001 zmulcl 12738 modcyc2 14040 cjreim 15320 tanval3 16295 dvdsnegb 16436 odd2np1 16504 modgcd 16698 pcexp 17030 cnfldmulg 21703 sinperlem 26802 sineq0 26845 efeq1 26849 asinlem3a 27191 atancj 27231 atantayl 27258 atantayl2 27259 zetacvg 27335 basellem3 27403 basellem9 27409 ipval2 31302 ipasslem2 31427 itg2addnclem3 38571 ftc1anclem6 38596 stoweidlem10 46989 |
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