Theorem 5re

Description: The number 5 is real. (Contributed by NM, 27-May-1999)

	Ref	Expression
Assertion	5re	$$⊢5\in ℝ$$

Proof

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