Axiom ax-i2m1 11222

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 11198. (Contributed by NM, 29-Jan-1995.)

Assertion

Ref	Expression
ax-i2m1	⊢ ((i · i) + 1) = 0

Detailed syntax breakdown of Axiom ax-i2m1

Step	Hyp	Ref	Expression
1		ci 11156	. . . 4 class i
2		cmul 11159	. . . 4 class ·
3	1, 1, 2	co 7423	. . 3 class (i · i)
4		c1 11155	. . 3 class 1
5		caddc 11157	. . 3 class +
6	3, 4, 5	co 7423	. 2 class ((i · i) + 1)
7		cc0 11154	. 2 class 0
8	6, 7	wceq 1533	1 wff ((i · i) + 1) = 0

This axiom is referenced by:  0cn  11252  mul02lem2  11437  addrid  11440  cnegex2  11442  ine0  11695  ixi  11889  inelr  12249  c0exALT  42015  sn-1ne2  42021  re1m1e0m0  42119  reixi  42144  sn-inelr  42187