Theorem 3re

Description: The number 3 is real. (Contributed by NM, 27-May-1999)

	Ref	Expression
Assertion	3re	$$⊢3\in ℝ$$

Proof

Step	Hyp	Ref	Expression
1		df-3	$$⊢3=2+1$$
2		2re	$$⊢2\in ℝ$$
3		1re	$$⊢1\in ℝ$$
4	2 3	readdcli	$$⊢2+1\in ℝ$$
5	1 4	eqeltri	$$⊢3\in ℝ$$