Metamath Proof Explorer


Theorem dmuz

Description: Domain of the upper integers function. (Contributed by Glauco Siliprandi, 23-Oct-2021)

Ref Expression
Assertion dmuz
|- dom ZZ>= = ZZ

Proof

Step Hyp Ref Expression
1 uzf
 |-  ZZ>= : ZZ --> ~P ZZ
2 1 fdmi
 |-  dom ZZ>= = ZZ