Theorem sqcli

Description: Closure of square. (Contributed by NM, 2-Aug-1999)

	Ref	Expression
Hypothesis	sqval.1	$$⊢A\in ℂ$$
Assertion	sqcli	$$⊢A^2\in ℂ$$

Proof

Step	Hyp	Ref	Expression
1		sqval.1	$$⊢A\in ℂ$$
2		sqcl	$$⊢A\in ℂ\to A^2\in ℂ$$
3	1 2	ax-mp	$$⊢A^2\in ℂ$$