Image (mathematics)像和原像

 f 是一由定义域X映射至到达域Y 的函数。

x_{0}是定义域X元素x_{0} f 之下的像便是f(x_{0})

 U 是定义域X子集 U  f 之下的像便是

{f(U)=} { {y\in Y:y=f(x)} 对于有些{\displaystyle {x\in U}}{x\in U} }

f is a function from domain X to codomain Y. The yellow oval inside Y is the image of f.

原像

 f 是一由定义域X映射至到达域Y 的函数。

V是到达域Y的子集,V f 之下的原像便是

{f^{{-1}}(V)=} {x\in X:y=f(x)} 对于有些{y\in V} }
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