Axiom ax-i2m1 11131

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 11107. (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 11065	. . . 4 class i
2		cmul 11068	. . . 4 class ·
3	1, 1, 2	co 7385	. . 3 class (i · i)
4		c1 11064	. . 3 class 1
5		caddc 11066	. . 3 class +
6	3, 4, 5	co 7385	. 2 class ((i · i) + 1)
7		cc0 11063	. 2 class 0
8	6, 7	wceq 1554	1 wff ((i · i) + 1) = 0

This axiom is referenced by:  0cn  11161  mul02lem2  11350  addrid  11353  cnegex2  11355  ine0  11612  ixi  11806  c0exALT  42816  sn-1ne2  42828  re1m1e0m0  42954  reixi  42980  sn-inelr  43057