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If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics , it is impossible not to be struck by the analogies existing . It seems to arise only when one concentrates on a single cue , while the actual classification process is multidimensional . But then , if this truly describes what happens in the genesis of memory , ( the question stated above arises :) when one remembers , is it this impressed affection that he remembers , or is it the objective thing from which this was derived ? Certain topics in harmonic analysis on semisimple groups arise naturally when one uses the Arthur-Selberg trace formula to study automorphic representations of adele groups . General and theoretical issues in systematics arise frequently when one is involved in empirical projects . Difficulties arise only when one good thing conflicts with another . We feel that these are issues of the sort which arise inevitably when one is proposing significant change .