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ehrenfest
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Homework Statement
http://books.google.com/books?id=Xm...GCQ&sig=Eqnkxjj7B9gc4-nig1fgUkk7AqQ#PPA207,M1
As you can see on page 207, Zwiebach obtained 12.6 by simply demanding that it be true.
He does this also in chapter 11 with equations such as 11.27 (which I do not think is on the free preview). He just postulates that they are true and then he uses them in later calculations!
I have no idea what he is thinking! How can he just say for example. "equation 11.58 is reasonable" and then pretend like it is true without proving it!
Homework Equations
The Attempt at a Solution
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