Axiom ax-addrcl 7910

Description: Closure law for addition in the real subfield of complex numbers. Axiom for real and complex numbers, justified by Theorem axaddrcl 7866. Proofs should normally use readdcl 7939 instead. (New usage is discouraged.) (Contributed by NM, 22-Nov-1994.)

Assertion

Ref	Expression
ax-addrcl	|- ( ( A e. RR /\ B e. RR ) -> ( A + B ) e. RR )

Detailed syntax breakdown of Axiom ax-addrcl

Step	Hyp	Ref	Expression
1		cA	. . . 4 class A
2		cr 7812	. . . 4 class RR
3	1, 2	wcel 2148	. . 3 wff A e. RR
4		cB	. . . 4 class B
5	4, 2	wcel 2148	. . 3 wff B e. RR
6	3, 5	wa 104	. 2 wff ( A e. RR /\ B e. RR )
7		caddc 7816	. . . 4 class +
8	1, 4, 7	co 5877	. . 3 class ( A + B )
9	8, 2	wcel 2148	. 2 wff ( A + B ) e. RR
10	6, 9	wi 4	1 wff ( ( A e. RR /\ B e. RR ) -> ( A + B ) e. RR )

This axiom is referenced by:  readdcl  7939