exercise left as an

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exercise, left as an /adj./ [from technical books] Used to complete a proof when one doesn't mind a handwave, or to avoid one entirely. The complete phrase is: "The proof [or `the rest'] is left as an exercise for the reader." This comment *has* occasionally been attached to unsolved research problems by authors possessed of either an evil sense of humor or a vast faith in the capabilities of their audiences.


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