Metamath Proof Explorer


Theorem sqge0d

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

Ref Expression
Hypothesis sqge0d.1 ( 𝜑𝐴 ∈ ℝ )
Assertion sqge0d ( 𝜑 → 0 ≤ ( 𝐴 ↑ 2 ) )

Proof

Step Hyp Ref Expression
1 sqge0d.1 ( 𝜑𝐴 ∈ ℝ )
2 sqge0 ( 𝐴 ∈ ℝ → 0 ≤ ( 𝐴 ↑ 2 ) )
3 1 2 syl ( 𝜑 → 0 ≤ ( 𝐴 ↑ 2 ) )