Theorem 3nn0

Description: 3 is a nonnegative integer. (Contributed by Mario Carneiro, 18-Feb-2014)

	Ref	Expression
Assertion	3nn0	$$⊢3\in {\mathbb{N}}_0$$

Proof

Step	Hyp	Ref	Expression
1		3nn	$$⊢3\in \mathbb{N}$$
2	1	nnnn0i	$$⊢3\in {\mathbb{N}}_0$$