I agree Fresh. I'm guessing it's because it's common in Denmark to use bars over ordinary letters ##\bar a## to represent vectors. This is also why it confuses me not to see a boldface ##\mathbf{A}## matrix but I instead see a ##\bar{\bar a}## which might be a matrix.
Assuming the above were...
Dear everyone.
I'm doing an assignment on vectorfields and for most of the assignment I have to deal with tensors and tensornotation.
The first assignment asks me to express the following vector and matrixproducts in tensornotation.
$$\overline c = \overline a + \overline b \\ d=(\overline a +...