This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

Metamath Proof Explorer

Theorem 2t2e4

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

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

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	$⊢ 2 \cdot 2 = 4$