Theorem nnxrd

Description: A natural number is an extended real. (Contributed by Glauco Siliprandi, 11-Dec-2019)

	Ref	Expression
Hypothesis	nnxrd.1	|- ( ph -> A e. NN )
Assertion	nnxrd	|- ( ph -> A e. RR* )

Proof

Step	Hyp	Ref	Expression
1		nnxrd.1	|- ( ph -> A e. NN )
2	1	nnred	|- ( ph -> A e. RR )
3	2	rexrd	|- ( ph -> A e. RR* )