【摘要】 投影算符是量子力学中一个很重要的算符 ,它在量子力学中有许多应用 ,其完备性关系是连接狄拉克表示与一般表示的桥梁 ,是将狄拉克表示转化为一般表示的枢纽。因此 ,有必要详细地讨论投影算符的几何意义、本征值、本征函数及其性质更多还原

【Abstract】 Projection operator is very important in quantum mechanics. And it has broad application in quantum mechanics. Its complete relationship is a bridge that connects Dirac Expression and general expression, and a pivot that can transform Dirac Expression to general expression. So it is necessary to discuss the geometry meaning , eigen value, eigen function and character of projection operator in detail.更多还原