Re: differences in Solve with -1/2 and -0.5

*To*: mathgroup at smc.vnet.net*Subject*: [mg44431] Re: differences in Solve with -1/2 and -0.5*From*: Bill Rowe <readnewscix at mail.earthlink.net>*Date*: Sat, 8 Nov 2003 04:51:12 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

On 11/7/03 at 5:16 AM, Kenneth_Levasseur at uml.edu (Kenneth Levasseur) wrote: > Can anyone give a good reason why there is a difference in the > following? Preferably one that my students will understand. > In[1]:= > Solve[D[x E^(-x/2), x] == 0, x] > Out[1]= > {{x -> 2}} > In[2]:= > Solve[D[x E^(-0.5*x), x] == 0, x] > General::dbyz:Division by zero. > Out[2]= > {} Hmm... With Mathematica 5.0 running on MacOS 10.3 I get the same as you with exact arguements but I get {{x->2.}} for the second case. This certainly seems reasonable. What version of Mathematica are you using? -- To reply via email subtract one hundred and nine