Theorem 7re

Description: The number 7 is real. (Contributed by NM, 27-May-1999)

	Ref	Expression
Assertion	7re	$$⊢7\in ℝ$$

Proof

Step	Hyp	Ref	Expression
1		df-7	$$⊢7=6+1$$
2		6re	$$⊢6\in ℝ$$
3		1re	$$⊢1\in ℝ$$
4	2 3	readdcli	$$⊢6+1\in ℝ$$
5	1 4	eqeltri	$$⊢7\in ℝ$$