函数 Function 概念

【数学科普】:

Function = f : R – > R
(with 1& only 1 image)

Mapping 映射 (l’Application) , can be non-value to non-value

仿射变换 Affine Transformation (解析几何 Analytic Geometry 的 Modern Math).

Affine 是 德文 (coined by Euler)

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