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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 ) |