Theorem nn0rei

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

	Ref	Expression
Hypothesis	nn0rei.1	⊢ 𝐴 ∈ ℕ0
Assertion	nn0rei	⊢ 𝐴 ∈ ℝ

Proof

Step	Hyp	Ref	Expression
1		nn0rei.1	⊢ 𝐴 ∈ ℕ0
2		nn0ssre	⊢ ℕ0 ⊆ ℝ
3	2 1	sselii	⊢ 𝐴 ∈ ℝ