Theorem 8re

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

	Ref	Expression
Assertion	8re	⊢ 8 ∈ ℝ

Proof

Step	Hyp	Ref	Expression
1		df-8	⊢ 8 = ( 7 + 1 )
2		7re	⊢ 7 ∈ ℝ
3		1re	⊢ 1 ∈ ℝ
4	2 3	readdcli	⊢ ( 7 + 1 ) ∈ ℝ
5	1 4	eqeltri	⊢ 8 ∈ ℝ