Last Updated：2025/11/20

(mathematics, of a function) Assuming each of the values in its codomain; having its range equal to its codomain.

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onto

Source Word

onto

IPA(Pronunciation)

not-comparable of a function

(mathematics, of a function) Assuming each of the values in its codomain; having its range equal to its codomain.

Japanese Meaning

全射（数学用語として、関数がその値の集合全体を網羅する状態を表す）

To prove the function is onto, we must show that every element of the codomain has a preimage.

その関数が全射であることを証明するには、余域の各要素に原像が存在することを示さなければなりません。

Sense（1）

(mathematics, of a function) Assuming each of the values in its codomain; having its range equal to its codomain.

Considered as a function on the real numbers, the exponential function is not onto.