Theorem 2t2e4

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

	Ref	Expression
Assertion	2t2e4	⊢ ( 2 · 2 ) = 4

Proof

Step	Hyp	Ref	Expression
1		2cn	⊢ 2 ∈ ℂ
2	1	2timesi	⊢ ( 2 · 2 ) = ( 2 + 2 )
3		2p2e4	⊢ ( 2 + 2 ) = 4
4	2 3	eqtri	⊢ ( 2 · 2 ) = 4