Hi,
I am very confused about the mathematics related to special relativity.
I have understood, that a four-vector with an upper index has the form:
$$A^\mu = (A^0 , A^1, A^2, A^3)$$
where lowering the index would make the indices other than the ##0##th negative:
$$A_\mu = (A_0, -A^1, -A^2...