Conic-Constructible Regular Polygons

John Conway conway at math.Princeton.EDU
Wed Dec 15 22:39:42 CET 1999

On Wed, 15 Dec 1999, John Conway wrote:

>    But solving a quartic can be done by solving a cubic and some
> quadratics, so we can instead regard the new move as solving a cubic.
> Now it's "obvious" (if you know Galois theory)  that the degree of any
> equation that can be solved by quadratics must have form  2^a.3^b

   but meant, of course, to write  "solved by quadratics and cubics".


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