Theorem times2d

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

	Ref	Expression
Hypothesis	2timesd.1	$$⊢\phi \to A\in ℂ$$
Assertion	times2d	$$⊢\phi \to A\cdot 2=A+A$$

Proof

Step	Hyp	Ref	Expression
1		2timesd.1	$$⊢\phi \to A\in ℂ$$
2		times2	$$⊢A\in ℂ\to A\cdot 2=A+A$$
3	1 2	syl	$$⊢\phi \to A\cdot 2=A+A$$