Theorem 0zd

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

	Ref	Expression
Assertion	0zd	⊢ ( 𝜑 → 0 ∈ ℤ )

Proof

Step	Hyp	Ref	Expression
1		0z	⊢ 0 ∈ ℤ
2	1	a1i	⊢ ( 𝜑 → 0 ∈ ℤ )