Theorem 1nn0

Description: 1 is a nonnegative integer. (Contributed by Raph Levien, 10-Dec-2002)

	Ref	Expression
Assertion	1nn0	$$⊢1\in {\mathbb{N}}_0$$

Proof

Step	Hyp	Ref	Expression
1		1nn	$$⊢1\in \mathbb{N}$$
2	1	nnnn0i	$$⊢1\in {\mathbb{N}}_0$$