Theorem 7nn0

Description: 7 is a nonnegative integer. (Contributed by Mario Carneiro, 19-Apr-2015)

	Ref	Expression
Assertion	7nn0	$$⊢7\in {\mathbb{N}}_0$$

Proof

Step	Hyp	Ref	Expression
1		7nn	$$⊢7\in \mathbb{N}$$
2	1	nnnn0i	$$⊢7\in {\mathbb{N}}_0$$