
Re: Cubics and roots
Posted:
Oct 15, 2012 4:58 AM


On 14/10/2012 13:45, Bill Taylor wrote: > The heptagon/trisection thread got me thinking > about an old query of mine, concerning the reach > of *real* cube roots, (NOT complex). > > Am I correct in thinking: that a cubic with > rational coefficients but no rational roots, > has solutions obtainable(from 1) via the four > basic operations AND real cube roots, > ** ifandonlyif ** > it has precisely one real root?
casus irreducibilis

