Theorem rexr

Description: A standard real is an extended real. (Contributed by NM, 14-Oct-2005)

	Ref	Expression
Assertion	rexr	$$⊢A\in ℝ\to A\in {ℝ}^{*}$$

Proof

Step	Hyp	Ref	Expression
1		ressxr	$$⊢ℝ\subseteq {ℝ}^{*}$$
2	1	sseli	$$⊢A\in ℝ\to A\in {ℝ}^{*}$$