Theorem nn0rei

Description: A nonnegative integer is a real number. (Contributed by NM, 14-May-2003)

	Ref	Expression
Hypothesis	nn0rei.1	$$⊢A\in {\mathbb{N}}_0$$
Assertion	nn0rei	$$⊢A\in ℝ$$

Proof

Step	Hyp	Ref	Expression
1		nn0rei.1	$$⊢A\in {\mathbb{N}}_0$$
2		nn0ssre	$$⊢{\mathbb{N}}_0\subseteq ℝ$$
3	2 1	sselii	$$⊢A\in ℝ$$