Axiom ax-rnegex 7981

Description: Existence of negative of real number. Axiom for real and complex numbers, justified by Theorem axrnegex 7939. (Contributed by Eric Schmidt, 21-May-2007.)

Assertion

Ref	Expression
ax-rnegex	⊢ (𝐴 ∈ ℝ → ∃𝑥 ∈ ℝ (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 7871	. . 3 class ℝ
3	1, 2	wcel 2164	. 2 wff 𝐴 ∈ ℝ
4		vx	. . . . . 6 setvar 𝑥
5	4	cv 1363	. . . . 5 class 𝑥
6		caddc 7875	. . . . 5 class +
7	1, 5, 6	co 5918	. . . 4 class (𝐴 + 𝑥)
8		cc0 7872	. . . 4 class 0
9	7, 8	wceq 1364	. . 3 wff (𝐴 + 𝑥) = 0
10	9, 4, 2	wrex 2473	. 2 wff ∃𝑥 ∈ ℝ (𝐴 + 𝑥) = 0
11	3, 10	wi 4	1 wff (𝐴 ∈ ℝ → ∃𝑥 ∈ ℝ (𝐴 + 𝑥) = 0)

This axiom is referenced by:  0re  8019  readdcan  8159  cnegexlem1  8194  cnegexlem2  8195  cnegexlem3  8196  cnegex  8197  renegcl  8280  ltadd2  8438