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Jan 14, 2011 at 7:56 comment added Martin Brandenburg Very instructive, 1+.
Feb 26, 2010 at 0:00 comment added KConrad The quote referred to at the start is due to Polya and Szego. In volume 1 page VIII of their Problems and Propositions in Analysis, they write "An idea which can be used only once is a trick. If one can use it more than once it becomes a method."
Feb 25, 2010 at 22:41 history answered BCnrd CC BY-SA 2.5