Function (函数)

Function (函数 hánshù) refers to a mathematical expression or rule that defines the relationship between a set of input variables and another set of output variables where each input is assigned to exactly one output.

• 函 (hán) as in letter (信函 xìnhán).
• 数 (shù) as in number (数字 shùzì) or mathematics (数学 shùxué).

Function (函数 hánshù) as in:

1. Production function (生产函数 shēngchǎn hánshù)
2. Triogonometric function (三角函数 sānjiǎo hánshù).