Theorem 2t2e4

Description: 2 times 2 equals 4. (Contributed by NM, 1-Aug-1999)

	Ref	Expression
Assertion	2t2e4	$$⊢2\cdot 2=4$$

Proof

Step	Hyp	Ref	Expression
1		2cn	$$⊢2\in ℂ$$
2	1	2timesi	$$⊢2\cdot 2=2+2$$
3		2p2e4	$$⊢2+2=4$$
4	2 3	eqtri	$$⊢2\cdot 2=4$$