Theorem 2timesi

Description: Two times a number. (Contributed by NM, 1-Aug-1999)

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

Proof

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