Theorem times2i

Description: A number times 2. (Contributed by NM, 11-May-2004)

	Ref	Expression
Hypothesis	2timesi.1	$$⊢A\in ℂ$$
Assertion	times2i	$$⊢A\cdot 2=A+A$$

Proof

Step	Hyp	Ref	Expression
1		2timesi.1	$$⊢A\in ℂ$$
2		times2	$$⊢A\in ℂ\to A\cdot 2=A+A$$
3	1 2	ax-mp	$$⊢A\cdot 2=A+A$$