# Definition:Irrational Number/Historical Note

## Historical Note on Irrational Number

It was the ancient Greeks who discovered that the irrational numbers were indispensable in geometry.

They were famously discovered by the Pythagoreans.

Some sources suggest that this discovery is one of their more important contributions towards civilisation.

## Sources

- 1937: Eric Temple Bell:
*Men of Mathematics*... (previous) ... (next): Chapter $\text{II}$: Modern Minds in Ancient Bodies - 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {B}.17$: More About Irrational Numbers. $\pi$ is Irrational