- #1
Corbeau
- 4
- 0
Hello. I'm going through Ray D'Inverno's "Introducing Einstein's Relativity" and I'm stuck at a certain point and can't move forward. It deals with tensors, I'm stuck at the transformation matrix and the problem is, I can't figure out what the key equation (5.7) actually means. There is a screenshot of the part of the page below, and I have no idea even how to start understanding it. What is it? What was it derived from? How do you actually use it? The left-hand side looks like a 1x1 matrix and the right-hand side looks like a n x n matrix and, of course, that wouldn't make any sense. If someone could write a few helpful sentences or point me in the direction of an Idiot's Guide to Tensor Differentiation, I would be most grateful. Thank you.
Screenshot:
Screenshot: