Definition:Image (Set Theory)/Mapping

Definition
Let $f: S \to T$ be a mapping.

Also known as
Some sources refer to this as the direct image of a mapping, in order to differentiate it from an inverse image.

Rather than apply a mapping $f$ directly to a subset $A$, those sources often prefer to define the direct image mapping of $f$ as a separate concept in its own right.

Also see

 * Definition:Domain of Mapping
 * Definition:Codomain of Mapping
 * Definition:Range of Relation


 * Definition:Preimage of Mapping (also known as Definition:Inverse Image)