Euclid:Proposition/VII/28

Proposition

In the words of Euclid:

If two numbers be prime to one another, the sum will also be prime to each of them; and if the sum of two numbers be prime to any one them, the original numbers will also be prime to one another.

(The Elements: Book $\text{VII}$: Proposition $28$)

Sources

• 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 2 (2nd ed.) ... (previous) ... (next): Book $\text{VII}$. Propositions