Re: Solve fails with this simple inequality problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg115764] Re: Solve fails with this simple inequality problem*From*: Peter Pein <petsie at dordos.net>*Date*: Thu, 20 Jan 2011 06:29:16 -0500 (EST)*References*: <ih6e6r$39v$1@smc.vnet.net>

On 19.01.2011 11:25, michael partensky wrote: > Ken, Sqrt returns by definition the *positive* root. > Your question would have been legit (with its syntax properly fixed) for > the negative root, but this must be handled by adding minus (-Sqrt[19]) > explicitly. > > Can anyone help to reformulate the problem to handle both signs elegantly? > Thanks > Michael Partenskii > > In[1]:= Solve[m == Floor[sqrt19 + 7] < 6 && sqrt19^2 == 19, {m, sqrt19}] Out[1]= {{m -> 2, sqrt19 -> -Sqrt[19]}} > > On Sun, Jan 16, 2011 at 5:55 AM, KenR<ramsey2879 at msn.com> wrote: > >> Solve[Meter = Floor[Sqrt[19]+7]&& Meter< 6, Meter] gives a null "{}" >> Any workarounds? >> >>