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6 Acknowledgements

I wish to thank the editors of Living Reviews for the invitation to write this article, and for their great patience in waiting for its delivery. I am also grateful to John Donoghue and Ted Jacobson for their many useful comments on an early draft of this review. My own ideas on this topic are heavily indebted to Steven Weinberg, as conveyed through his graduate lectures on quantum field theory (and now by his textbooks on the subject).


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