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This review is from: Emmy Noether's Wonderful Theorem (Paperback)
I got as far as page 28 where the author states what he calls "the fundamental lemma of the calculus of variations". Unfortunately, the lemma as he states it is false. (For a counter-example, just put a = 0 , b = 2 pi, eta (t) = sin (t) and A(t) = 1.)
If the author can not get even a "fundamental lemma" right, what chance is there that he can get anything else right ? And why should I read any further, since I can no longer trust what he writes?
I can guess what he may have meant to write, but I don't buy a book like this so that I can waste my time struggling to guess the author's intentions. I expect him to make his meaning clear, and to state his theorems correctly.