Axiom ax-addrcl 7871

Description: Closure law for addition in the real subfield of complex numbers. Axiom for real and complex numbers, justified by Theorem axaddrcl 7827. Proofs should normally use readdcl 7900 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 7773	. . . 4 class RR
3	1, 2	wcel 2141	. . 3 wff A e. RR
4		cB	. . . 4 class B
5	4, 2	wcel 2141	. . 3 wff B e. RR
6	3, 5	wa 103	. 2 wff ( A e. RR /\ B e. RR )
7		caddc 7777	. . . 4 class +
8	1, 4, 7	co 5853	. . 3 class ( A + B )
9	8, 2	wcel 2141	. 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  7900