Theorem 3z

Description: 3 is an integer. (Contributed by David A. Wheeler, 8-Dec-2018)

	Ref	Expression
Assertion	3z	$$⊢3\in \mathbb{Z}$$

Proof

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