Theorem sq3

Description: The square of 3 is 9. (Contributed by NM, 26-Apr-2006)

	Ref	Expression
Assertion	sq3	⊢ ( 3 ↑ 2 ) = 9

Proof

Step	Hyp	Ref	Expression
1		3cn	⊢ 3 ∈ ℂ
2	1	sqvali	⊢ ( 3 ↑ 2 ) = ( 3 · 3 )
3		3t3e9	⊢ ( 3 · 3 ) = 9
4	2 3	eqtri	⊢ ( 3 ↑ 2 ) = 9