计算器JAVA小程序，实现了加减乘除等基本运算。-Calculator JAVA applet, realize the basic operation such as add, subtract, multiply and divide.

本教程将详细介绍两种基本运算放大器的拓扑结构(电压反馈(VFB)与电流反馈(CFB))，并 说明其差异。图1中再次列出了基本电压反馈运算放大器和增益公式。-This tutorial will introduced two kinds of basic topology structure of the operational amplifier ((VFB) voltage feedback and current feedback (CFB)), and Explain the diff

很实用的C#矩阵运算类，其包括基本的矩阵加减，矩阵乘法，转置 ，求逆等运算-Very useful matrix operations C# class that includes basic addition and subtraction of matrices, matrix multiplication, transpose, inverse operation, etc.