Theorem 1red

Description: The number 1 is real, deduction form. (Contributed by David A. Wheeler, 6-Dec-2018)

	Ref	Expression
Assertion	1red	|- ( ph -> 1 e. RR )

Proof

Step	Hyp	Ref	Expression
1		1re	|- 1 e. RR
2	1	a1i	|- ( ph -> 1 e. RR )