Euclid:Proposition/X/11

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Proposition

In the words of Euclid:

If four magnitudes be proportional, and the first be commensurable with the second, the third will also be commensurable with the fourth; and, if the first be incommensurable with the second, the third will also be incommensurable with the fourth.

(The Elements: Book $\text{X}$: Proposition $11$)


Sources