# Definition:Quaternion/Historical Note

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## Historical Note on Quaternions

The **quaternions** were famously conceived by William Rowan Hamilton, who was so proud of his flash of insight that he carved:

- $i^2 = j^2 = k^2 = i j k = -1$

into the stone of Brougham Bridge on $16$th October $1843$.

However, it is also worth noting that Carl Friedrich Gauss independently came up with the same concept in $1819$.

## Sources

- 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {B}.26$: Extensions of the Complex Number System. Algebras, Quaternions, and Lagrange's Four Squares Theorem