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Main Question or Discussion Point
Hello. I am confused about the notation for tensors and vectors. From what I saw, for a 4vector the notation is with upper index. But for a second rank tensor (electromagnetic tensor for example) the notation is also upper index. I attached a screenshot of this. Initially I thought that for vectors there is upper index while for tensors there is lower index but now I am really confused (see second image). What is the actual notation? Thank you!
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