一一映射

yīyī yìngshè

noun

Meanings

1 bijection (mathematics)
2 one-to-one mapping

Characters

to shoot / project

Examples

HSK 7-9

这两个集合之间存在一一映射。

Zhè liǎng gè jíhé zhījiān cúnzài yīyī yìngshè.

There exists a bijection between these two sets.

HSK 7-9

函数 f 是一个一一映射。

Hánshù f shì yīgè yīyī yìngshè.

The function f is a bijection.

Tips

memory

Literally 'one-to-one map'. 一一 (yīyī) = each-to-each, 映射 (yìngshè) = map/mapping. Read it as 'each element pairs with exactly one' and the math definition follows.

Stroke Order

一 yī

映 yìng

射 shè