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Axiom ax-i2m1 9581
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 9557. (Contributed by NM, 29-Jan-1995.)
Assertion
Ref Expression
ax-i2m1

Detailed syntax breakdown of Axiom ax-i2m1
StepHypRef Expression
1 ci 9515 . . . 4
2 cmul 9518 . . . 4
31, 1, 2co 6296 . . 3
4 c1 9514 . . 3
5 caddc 9516 . . 3
63, 4, 5co 6296 . 2
7 cc0 9513 . 2
86, 7wceq 1395 1
Colors of variables: wff setvar class
This axiom is referenced by:  0cn  9609  mul02lem2  9778  addid1  9781  cnegex2  9783  ine0  10017  ixi  10203  inelr  10551
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