This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

Metamath Proof Explorer

Theorem 0zd

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

		Ref	Expression
	Assertion	0zd	$⊢ φ \to 0 \in ℤ$

Step	Hyp	Ref	Expression
1		0z	$⊢ 0 \in ℤ$
2	1	a1i	$⊢ φ \to 0 \in ℤ$