Euclid:Proposition/IX/21

Proposition

In the words of Euclid:

If as many even numbers as we please be added together, the whole is even.

(The Elements: Book $\text{IX}$: Proposition $21$)

Sources

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