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Oct 7, 2014 at 13:46 comment added Jim Stasheff Thanks for the responses, especially Igor's since H&T is by my side right now and is in the context that provoked the question. quoting `` it is useful to use the analogy with Green's functions to get an insight of what is going on'' applies only if one has some feeling for Green's functions
Oct 6, 2014 at 9:41 history answered Zurab Silagadze CC BY-SA 3.0