To find two straight lines incommensurable with a given straight line, the one (incommensurable) in length only, the other also (incommensurable) in square. * Let $A$ be the given straight line. * So it is required to find two straight lines incommensurable with $A$, the one (incommensurable) in length only, the other also (incommensurable) in square.
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Proofs: 1
This whole proposition is regarded by Heiberg as an interpolation into the original text (translator's note). ↩