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The problem of finding a cube having a volume exactly double that of a cube whose side length is known; especially by means of geometrical methods that employ only a straight-edge and a compass.

Solving the Delian problem is algebraically equivalent to constructing a line segment whose length is the cube root of two. Although solutions to the problem have existed since the Classical era, it was proved in 1837 that it could not be solved by means of straight-edge and compass.

Early 18th century; earliest use found in Ephraim Chambers (?1680–1740), encyclopaedist.

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