Theorem 8re

Description: The number 8 is real. (Contributed by NM, 27-May-1999)

	Ref	Expression
Assertion	8re	$$⊢8\in ℝ$$

Proof

Step	Hyp	Ref	Expression
1		df-8	$$⊢8=7+1$$
2		7re	$$⊢7\in ℝ$$
3		1re	$$⊢1\in ℝ$$
4	2 3	readdcli	$$⊢7+1\in ℝ$$
5	1 4	eqeltri	$$⊢8\in ℝ$$