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Surjective function
Set
context | $X,Y$ |
definiendum | $f\in$ it |
inclusion | $f:X\to Y $ |
postulate | $\text{im}(f)=Y $ |
Discussion
A function can only be or not be surjective w.r.t. to a stated codomain. A function is always surjective w.r.t. it's own image. See Function for further discussion.
Predicates
predicate | $Y$ … countable $\equiv \mathrm{Surjective}(\mathbb{N},Y)\neq\emptyset$ |