Theorem msqge0d

Description: A square is nonnegative. (Contributed by Mario Carneiro, 27-May-2016)

	Ref	Expression
Hypothesis	leidd.1	$$⊢\phi \to A\in ℝ$$
Assertion	msqge0d	$$⊢\phi \to 0\le AA$$

Proof

Step	Hyp	Ref	Expression
1		leidd.1	$$⊢\phi \to A\in ℝ$$
2		msqge0	$$⊢A\in ℝ\to 0\le AA$$
3	1 2	syl	$$⊢\phi \to 0\le AA$$