Theorem sqcld

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

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

Proof

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