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**"the classical theory of fields" by Landau**

I hope this is in the right forum, if not sorry- please move it.

I'm reading "the classical theory of fields" by Landau and Lifgarbagez at the moment (if you've not heard of it it covers special relativity/ relativistic em/ general relativity). Though it introduces all the maths used, I'm finding the explanations a bit too brief and a bit hard to follow when it's applied later in the book. So I was wondering if there are any suitable books that just go through the maths I could read in combination with Landau?

The material I'm struggling with is mostly tensor calculus, as an example of level please see pages 20-23 on the google preview: http://books.google.co.uk/books?hl=...=X&oi=book_result&resnum=1&ct=result#PPA21,M1

Any suggestions welcome,

thanks.