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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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