The set of all images

Let ƒ be a function from set A to set B (ƒ: A → B), then

The set of all images constitutes the of ƒ.  The of ƒ is denoted by ƒ(A) and it is a of set B.  In other words ƒ(A) ⊆ B.

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Reference

Introduction to Differential Calculus (Systematic Studies with Engineering Applications for Beginners) - 2012