Theorem 1zzd

Description: One is an integer, deduction form. (Contributed by David A. Wheeler, 6-Dec-2018)

	Ref	Expression
Assertion	1zzd	⊢ ( 𝜑 → 1 ∈ ℤ )

Proof

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