Theorem 7re

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

	Ref	Expression
Assertion	7re	|- 7 e. RR

Proof

Step	Hyp	Ref	Expression
1		df-7	|- 7 = ( 6 + 1 )
2		6re	|- 6 e. RR
3		1re	|- 1 e. RR
4	2 3	readdcli	|- ( 6 + 1 ) e. RR
5	1 4	eqeltri	|- 7 e. RR