Theorem 0zd

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

	Ref	Expression
Assertion	0zd	$$⊢\phi \to 0\in \mathbb{Z}$$

Proof

Step	Hyp	Ref	Expression
1		0z	$$⊢0\in \mathbb{Z}$$
2	1	a1i	$$⊢\phi \to 0\in \mathbb{Z}$$