Definition:Euler Phi Function/Historical Note
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Historical Note on Euler $\phi$ Function
The Euler $\phi$ function was invented by Leonhard Paul Euler in $1760$ in order to generalise Fermat's Little Theorem to non-prime indices.
Sources
- 1972: George F. Simmons: Differential Equations ... (previous) ... (next): $\S 3$: Appendix $\text A$: Euler
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): phi function (totient function)
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Euler's phi function (phi function, totient function)