Theorem sq7

Description: The square of 7 is 49. (Contributed by SN, 26-Aug-2025)

	Ref	Expression
Assertion	sq7	⊢ ( 7 ↑ 2 ) = ; 4 9

Proof

Step	Hyp	Ref	Expression
1		7cn	⊢ 7 ∈ ℂ
2	1	sqvali	⊢ ( 7 ↑ 2 ) = ( 7 · 7 )
3		7t7e49	⊢ ( 7 · 7 ) = ; 4 9
4	2 3	eqtri	⊢ ( 7 ↑ 2 ) = ; 4 9