Axiom ax-rnegex 10007

Description: Existence of negative of real number. Axiom 15 of 22 for real and complex numbers, justified by theorem axrnegex 9983. (Contributed by Eric Schmidt, 21-May-2007.)

Assertion

Ref	Expression
ax-rnegex	|- ( A e. RR -> E. x e. RR ( A + x ) = 0 )

Distinct variable group:   x, A

Detailed syntax breakdown of Axiom ax-rnegex

Step	Hyp	Ref	Expression
1		cA	. . 3 class A
2		cr 9935	. . 3 class RR
3	1, 2	wcel 1990	. 2 wff A e. RR
4		vx	. . . . . 6 setvar x
5	4	cv 1482	. . . . 5 class x
6		caddc 9939	. . . . 5 class +
7	1, 5, 6	co 6650	. . . 4 class ( A + x )
8		cc0 9936	. . . 4 class 0
9	7, 8	wceq 1483	. . 3 wff ( A + x ) = 0
10	9, 4, 2	wrex 2913	. 2 wff E. x e. RR ( A + x ) = 0
11	3, 10	wi 4	1 wff ( A e. RR -> E. x e. RR ( A + x ) = 0 )

This axiom is referenced by:  0re  10040  00id  10211  addid1  10216  cnegex  10217  renegcli  10342