Exercise, left as an

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The Jargon File

Parts of this article are based on the Jargon File, v. 4.4.7,
a public domain document of hacker jargon.

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exercise, left as an
Usage: adj.
Derivation: From technical books


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.

Sources

Source: exercise, left as an, in The Jargon File, version 4.4.7.


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