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Metamath Proof Explorer

Theorem sq1

Description: The square of 1 is 1. (Contributed by NM, 22-Aug-1999)

		Ref	Expression
	Assertion	sq1	$⊢ 1^{2} = 1$

Step	Hyp	Ref	Expression
1		2z	$⊢ 2 \in ℤ$
2		1exp	$⊢ 2 \in ℤ \to 1^{2} = 1$
3	1 2	ax-mp	$⊢ 1^{2} = 1$