Theorem 2re

Description: The number 2 is real. (Contributed by NM, 27-May-1999)

	Ref	Expression
Assertion	2re	⊢ 2 ∈ ℝ

Proof

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