Axiom:Euclid's Common Notion 4

Common Notion

In the words of Euclid:

Things which coincide with one another are equal to one another.

(The Elements: Book $\text{I}$: Common Notions: Common Notion $4$)

Sources

• 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 1 (2nd ed.) ... (previous) ... (next): Book $\text{I}$. Common Notions
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): Euclidean geometry
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Euclidean geometry