Theorem sqge0d

Description: The square of a real is nonnegative, deduction form. (Contributed by Mario Carneiro, 28-May-2016)

	Ref	Expression
Hypothesis	sqge0d.1	|- ( ph -> A e. RR )
Assertion	sqge0d	|- ( ph -> 0 <_ ( A ^ 2 ) )

Proof

Step	Hyp	Ref	Expression
1		sqge0d.1	|- ( ph -> A e. RR )
2		sqge0	|- ( A e. RR -> 0 <_ ( A ^ 2 ) )
3	1 2	syl	|- ( ph -> 0 <_ ( A ^ 2 ) )