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Greater implies unequal?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg75236] Greater implies unequal?
*From*: anguzman at ing.uchile.cl
*Date*: Sat, 21 Apr 2007 23:12:18 -0400 (EDT)
Hello:
I'm using Mathematica v5. Why do I get?:
Clear[a]; Remove[a]
In[43]:=
Simplify[Sqrt[a]!=0,a>0]
Out[43]=
Sqrt[a] != 0
In[46]:=
Simplify[Sqrt[2]!=0,a>0]
Out[46]=
True
In[47]:=
2!=3
Out[47]=
True
In[48]:=
Simplify[Sqrt[2 a]!=0,a>0]
Out[48]=
Sqrt[a] != 0
Does anyone else get this? The main problem is In[43] and Out[43]. I checked
that "a" does not have a pre-defined value, or Sqrt. I also get :
In[50]:=
Simplify[Sqrt[a]>0,a>0 ]
Out[50]=
True
In[51]:=
Simplify[Sqrt[a]<0,a>0 ]
Out[51]=
False
Well, I think it makes more sense that Out[50]or Out[51] were undefined...
Atte. Andres Guzman
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