| 一对一 | yī duì yī | one-to-one / one-on-one | ![]() |
| 单射 | dān shè | (math.) one-to-one function / injective map | ![]() |
| 一一对应 | yī yī duì yìng | one-to-one correspondence | ![]() |
| 一一映射 | yī yī yìng shè | bijective map (i.e. map between sets in math. that is one-to-one and onto) / one-to-one correspondence | ![]() |
