Description: The domain of a partial function. (Contributed by Glauco Siliprandi, 26-Jun-2021)
Ref | Expression | ||
---|---|---|---|
Assertion | elpmi2 | |- ( F e. ( A ^pm B ) -> dom F C_ B ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elpmi | |- ( F e. ( A ^pm B ) -> ( F : dom F --> A /\ dom F C_ B ) ) |
|
2 | 1 | simprd | |- ( F e. ( A ^pm B ) -> dom F C_ B ) |