Definition:Complex Number/Imaginary Unit/Historical Note
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Historical Note on $i$
The symbol $i$ that is in widespread use for the imaginary unit was due to Leonhard Paul Euler's influence.
Sources
- 1972: George F. Simmons: Differential Equations ... (previous) ... (next): $\S 3$: Appendix $\text A$: Euler
- 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {A}.21$: Euler ($\text {1707}$ – $\text {1783}$)