Theorem 5re

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

	Ref	Expression
Assertion	5re	⊢ 5 ∈ ℝ

Proof

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