Timeline for Minimal polynomial of cos(π/n)
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 28, 2017 at 18:19 | comment | added | tomasz | I see. That seems more reasonable, thanks for clearing that up. | |
| Nov 28, 2017 at 13:27 | comment | added | Vladimir Dotsenko | @tomasz: A slightly less explicit recipe (more or less the same as the one Fedor Petrov gives in another answer) was given already by D.H.Lehmer (A Note on Trigonometric Algebraic Numbers, The American Mathematical Monthly Vol. 40, No. 3 (Mar., 1933), pp. 165-166, jstor.org/stable/2301023) in 1933, 60 years before Watkins and Zeitlin. So in a way it has been known for a very long time, but Watkins and Zeitlin found a nice formula relating it to Chebyshev's polynomials. | |
| Nov 28, 2017 at 10:54 | comment | added | tomasz | It's really surprising this was published in 1993. If you had asked me before, I would have wagered it should have been done by 1950. Do you know if there is any substantial difficulty involved, or is it just that no one bothered before? | |
| Nov 27, 2017 at 20:17 | vote | accept | pavpanchekha | ||
| Nov 27, 2017 at 18:29 | history | answered | Vladimir Dotsenko | CC BY-SA 3.0 |