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 Exercise [04.05] b 
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Joined: 07 Jun 2008, 08:21
Posts: 235
Post Exercise [04.05] b
Penrose gives this exercise his "very straightforward" rating and in my solution I just use the expression which is the subject of exercise 4.4 and simple algebra to show that the expression on page 79 follows from this.
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I just noticed that my solution is very similar to AlvaroJ's solution in the exercise discussion forum. The trouble with the solution obtained by substituting ix for x is that it gives no insight into what is going on, which AlvaroJ's solution and my solution do.

15 Nov 2011, 08:07
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