1)  mathematical function

2)  math library

1.
In this paper,several methods for active programming with VC++ and MATLAB are discussed briefly,and an essential way of encapsulating the MATLAB math library in the environment of VC++ is advanced.

3)  collectionn of mathematical function

4)  Optical function

1.
First-principal calculations of band structure and optical functions of 3C-SiC;
3C-SiC的能带结构和光学函数的第一性原理计算
2.
The band structure and optical functions of Al2O3 were studied by the CASTEP software based on the first-principal.

5)  Function teaching

1.
Next, observing the actual classroom function teaching in some Junior middle schools and senior high schools.

6)  Function learning

## 目录

• 1 概述
• 2 历史
• 3 正式定义
• 4 定义域、对映域和值域
• 5 函数图像
• 6 Images and preimages
• 7 单射、满射与双射函数
• 8 函数例子
• 9 n-ary function: function of several variables
• 10 Composing functions
• 10.1 Inverse function
• 10.2 Restrictions and extensions
• 11 Pointwise operations
• 12 可计算和不可计算函数
• 13 Functions from the category viewpoint
• 14 参见
• 15 外部连接

## [编辑]历史

18世纪中叶，函数一词又被欧拉（Leonhard Euler）用于描述含有多个变量的表达式，例如f(x) = sin(x) + x3

19世纪的数学家开始对数学的各个分支作规范整理。