Description: Domain of the upper integers function. (Contributed by Glauco Siliprandi, 23-Oct-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | dmuz | |- dom ZZ>= = ZZ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | uzf | |- ZZ>= : ZZ --> ~P ZZ |
|
2 | 1 | fdmi | |- dom ZZ>= = ZZ |