inverse image

Noun

 * 1) The set of points that map to a given point (or set of points) under a specified function.
 * Under the function given by $$f(x)=x^2$$, the inverse image of 4 is $$\{-2,2\}$$, as is the inverse image of $$\{4\}$$.

Translations

 * Portuguese: imagem inversa, imagem recíproca
 * Romanian: imagine inversă