Theorem rehalfcld

Description: Real closure of half. (Contributed by Mario Carneiro, 27-May-2016)

	Ref	Expression
Hypothesis	rehalfcld.1	$$⊢\phi \to A\in ℝ$$
Assertion	rehalfcld	$$⊢\phi \to \frac{A}{2}\in ℝ$$

Proof

Step	Hyp	Ref	Expression
1		rehalfcld.1	$$⊢\phi \to A\in ℝ$$
2		rehalfcl	$$⊢A\in ℝ\to \frac{A}{2}\in ℝ$$
3	1 2	syl	$$⊢\phi \to \frac{A}{2}\in ℝ$$