Theorem resqcld

Description: Closure of square in reals. (Contributed by Mario Carneiro, 28-May-2016)

	Ref	Expression
Hypothesis	resqcld.1	|- ( ph -> A e. RR )
Assertion	resqcld	|- ( ph -> ( A ^ 2 ) e. RR )

Proof

Step	Hyp	Ref	Expression
1		resqcld.1	|- ( ph -> A e. RR )
2		resqcl	|- ( A e. RR -> ( A ^ 2 ) e. RR )
3	1 2	syl	|- ( ph -> ( A ^ 2 ) e. RR )