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Mirrors > Home > MPE Home > Th. List > ax-i2m1 | Structured version Visualization version GIF version |
Description: i-squared equals -1 (expressed as i-squared plus 1 is 0). Axiom 12 of 22 for real and complex numbers, justified by theorem axi2m1 9859. (Contributed by NM, 29-Jan-1995.) |
Ref | Expression |
---|---|
ax-i2m1 | ⊢ ((i · i) + 1) = 0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ci 9817 | . . . 4 class i | |
2 | cmul 9820 | . . . 4 class · | |
3 | 1, 1, 2 | co 6549 | . . 3 class (i · i) |
4 | c1 9816 | . . 3 class 1 | |
5 | caddc 9818 | . . 3 class + | |
6 | 3, 4, 5 | co 6549 | . 2 class ((i · i) + 1) |
7 | cc0 9815 | . 2 class 0 | |
8 | 6, 7 | wceq 1475 | 1 wff ((i · i) + 1) = 0 |
Colors of variables: wff setvar class |
This axiom is referenced by: 0cn 9911 mul02lem2 10092 addid1 10095 cnegex2 10097 ine0 10344 ixi 10535 inelr 10887 |
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