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Metamath Proof Explorer

Theorem sq2

Description: The square of 2 is 4. (Contributed by NM, 22-Aug-1999)

		Ref	Expression
	Assertion	sq2	$⊢ 2^{2} = 4$

Step	Hyp	Ref	Expression
1		2cn	$⊢ 2 \in ℂ$
2	1	sqvali	$⊢ 2^{2} = 2 \cdot 2$
3		2t2e4	$⊢ 2 \cdot 2 = 4$
4	2 3	eqtri	$⊢ 2^{2} = 4$