Theorem 3nn0

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

	Ref	Expression
Assertion	3nn0	⊢ 3 ∈ ℕ0

Proof

Step	Hyp	Ref	Expression
1		3nn	⊢ 3 ∈ ℕ
2	1	nnnn0i	⊢ 3 ∈ ℕ0