Recent content by Mingfeng

I just had a class in Analysis. My professor said that √ is defined to get positive number. √9=3 that is arithmetics. when you have x^2=9, you get x = +or -√9 = +or-3 that is algebra. Note: in both case √9=3 For the complex number √-9= √- * √9 = i3

Homework Statement Hi, this is the first time I post a thread in this forum. I am not sure if I could post this question here since it is not a homework problem. I have trouble understanding two boundary condition between nonconductor and conductor from Maxwell's equations in dynamic case...