Theorem sqvald

Description: Value of square. Inference version. (Contributed by Mario Carneiro, 28-May-2016)

	Ref	Expression
Hypothesis	expcld.1	$$⊢\phi \to A\in ℂ$$
Assertion	sqvald	$$⊢\phi \to A^2=AA$$

Proof

Step	Hyp	Ref	Expression
1		expcld.1	$$⊢\phi \to A\in ℂ$$
2		sqval	$$⊢A\in ℂ\to A^2=AA$$
3	1 2	syl	$$⊢\phi \to A^2=AA$$