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I am reading a marvelous book Classical Field Theory by E Soper, but it is mathematically too compact and sometimes I am unable to follow the equations. Can anyone suggest a side book for solution of my problem regarding reading the book? I also have Classical Theory of Fields by Landau but its content and way of expression is not relevant with my book. The question which you people are saying is a possible duplicate of was asked by myself and in that question I tried to find a good book on Classical Field Theory.But here I need help to read a particular book on the same subject. So in this way I am trying to justify my attempt as to make it a new question.