【摘要】 用几种不同的方法对电磁场的不变量进行了求证和讨论 ,指出每种方法都可以归结为利用四维协变张量元素本身构造出洛伦兹不变量更多还原

【Abstract】 Several methods for solving and proving the invariant of the electromagnetic field are given and discussed. It is pointed out that the invariant determined from different methods can written over a certain type of expression, i. e. the assembly made up of the elements of the four dimensional covariant tensor.更多还原