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Mirrors > Home > MPE Home > Th. List > ixi | Structured version Visualization version GIF version |
Description: i times itself is minus 1. (Contributed by NM, 6-May-1999.) (Proof shortened by Andrew Salmon, 19-Nov-2011.) |
Ref | Expression |
---|---|
ixi | ⊢ (i · i) = -1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-neg 10148 | . 2 ⊢ -1 = (0 − 1) | |
2 | ax-i2m1 9883 | . . 3 ⊢ ((i · i) + 1) = 0 | |
3 | 0cn 9911 | . . . 4 ⊢ 0 ∈ ℂ | |
4 | ax-1cn 9873 | . . . 4 ⊢ 1 ∈ ℂ | |
5 | ax-icn 9874 | . . . . 5 ⊢ i ∈ ℂ | |
6 | 5, 5 | mulcli 9924 | . . . 4 ⊢ (i · i) ∈ ℂ |
7 | 3, 4, 6 | subadd2i 10248 | . . 3 ⊢ ((0 − 1) = (i · i) ↔ ((i · i) + 1) = 0) |
8 | 2, 7 | mpbir 220 | . 2 ⊢ (0 − 1) = (i · i) |
9 | 1, 8 | eqtr2i 2633 | 1 ⊢ (i · i) = -1 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1475 (class class class)co 6549 0cc0 9815 1c1 9816 ici 9817 + caddc 9818 · cmul 9820 − cmin 10145 -cneg 10146 |
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-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-po 4959 df-so 4960 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-pnf 9955 df-mnf 9956 df-ltxr 9958 df-sub 10147 df-neg 10148 |
This theorem is referenced by: recextlem1 10536 inelr 10887 cju 10893 irec 12826 i2 12827 crre 13702 remim 13705 remullem 13716 sqrtneglem 13855 absi 13874 sinhval 14723 coshval 14724 cosadd 14734 absefib 14767 efieq1re 14768 demoivreALT 14770 ncvspi 22764 cphipval2 22848 itgmulc2 23406 tanarg 24169 atandm2 24404 efiasin 24415 asinsinlem 24418 asinsin 24419 asin1 24421 efiatan 24439 atanlogsublem 24442 efiatan2 24444 2efiatan 24445 tanatan 24446 atantan 24450 atans2 24458 dvatan 24462 log2cnv 24471 nvpi 26906 ipasslem10 27078 polid2i 27398 lnophmlem2 28260 iexpire 30874 itgmulc2nc 32648 dvasin 32666 |
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