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Mirrors > Home > MPE Home > Th. List > mulid2 | Structured version Visualization version GIF version |
Description: Identity law for multiplication. Note: see mulid1 9916 for commuted version. (Contributed by NM, 8-Oct-1999.) |
Ref | Expression |
---|---|
mulid2 | ⊢ (𝐴 ∈ ℂ → (1 · 𝐴) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-1cn 9873 | . . 3 ⊢ 1 ∈ ℂ | |
2 | mulcom 9901 | . . 3 ⊢ ((1 ∈ ℂ ∧ 𝐴 ∈ ℂ) → (1 · 𝐴) = (𝐴 · 1)) | |
3 | 1, 2 | mpan 702 | . 2 ⊢ (𝐴 ∈ ℂ → (1 · 𝐴) = (𝐴 · 1)) |
4 | mulid1 9916 | . 2 ⊢ (𝐴 ∈ ℂ → (𝐴 · 1) = 𝐴) | |
5 | 3, 4 | eqtrd 2644 | 1 ⊢ (𝐴 ∈ ℂ → (1 · 𝐴) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∈ wcel 1977 (class class class)co 6549 ℂcc 9813 1c1 9816 · cmul 9820 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-mulcl 9877 ax-mulcom 9879 ax-mulass 9881 ax-distr 9882 ax-1rid 9885 ax-cnre 9888 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-iota 5768 df-fv 5812 df-ov 6552 |
This theorem is referenced by: mulid2i 9922 mulid2d 9937 muladd11 10085 1p1times 10086 mul02lem1 10091 cnegex2 10097 mulm1 10350 div1 10595 recdiv 10610 divdiv2 10616 conjmul 10621 ser1const 12719 expp1 12729 recan 13924 arisum 14431 geo2sum 14443 prodrblem 14498 prodmolem2a 14503 risefac1 14603 fallfac1 14604 bpoly3 14628 bpoly4 14629 sinhval 14723 coshval 14724 demoivreALT 14770 gcdadd 15085 gcdid 15086 cncrng 19586 cnfld1 19590 cnfldmulg 19597 blcvx 22409 icccvx 22557 cnlmod 22748 coeidp 23823 dgrid 23824 quartlem1 24384 asinsinlem 24418 asinsin 24419 atantan 24450 musumsum 24718 brbtwn2 25585 axsegconlem1 25597 ax5seglem1 25608 ax5seglem2 25609 ax5seglem4 25612 ax5seglem5 25613 axeuclid 25643 axcontlem2 25645 axcontlem4 25647 cncvcOLD 26822 subdivcomb2 30865 dvcosax 38816 |
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