Metamath Proof Explorer

Theorem 0zd

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

Ref Expression
Assertion 0zd 
|- ( ph -> 0 e. ZZ )

Proof

Step Hyp Ref Expression
1 0z 
 |-  0 e. ZZ
2 1 a1i 
 |-  ( ph -> 0 e. ZZ )