Theorem halfcld

Description: Closure of half of a number (frequently used special case). (Contributed by Mario Carneiro, 27-May-2016)

	Ref	Expression
Hypothesis	2timesd.1	|- ( ph -> A e. CC )
Assertion	halfcld	|- ( ph -> ( A / 2 ) e. CC )

Proof

Step	Hyp	Ref	Expression
1		2timesd.1	|- ( ph -> A e. CC )
2		halfcl	|- ( A e. CC -> ( A / 2 ) e. CC )
3	1 2	syl	|- ( ph -> ( A / 2 ) e. CC )