Theorem times2d

Description: A number times 2. (Contributed by Mario Carneiro, 27-May-2016)

	Ref	Expression
Hypothesis	2timesd.1	|- ( ph -> A e. CC )
Assertion	times2d	|- ( ph -> ( A x. 2 ) = ( A + A ) )

Proof

Step	Hyp	Ref	Expression
1		2timesd.1	|- ( ph -> A e. CC )
2		times2	|- ( A e. CC -> ( A x. 2 ) = ( A + A ) )
3	1 2	syl	|- ( ph -> ( A x. 2 ) = ( A + A ) )