Re: odd mathematica blindspot
- To: mathgroup at smc.vnet.net
- Subject: [mg56502] Re: odd mathematica blindspot
- From: Skirmantas <skirmantas.janusonis at yale.edu>
- Date: Tue, 26 Apr 2005 21:53:49 -0400 (EDT)
- References: <d4klbs$eg7$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi Ed,
By definition, 9999999999999/10000000000000 is an exact rational number, whereas 0.5 is an approximate real number:
In[2]:=
0.5===1/2
Out[2]=
False
In[9]:=
9999999999/10000000000===0.9999999999
Out[9]=
False
In[10]:=
9999999999./10000000000===0.9999999999
Out[10]=
True
So:
In[11]:=Solve[(9999999999999/10000000000000)^x == .5, x]
Out[11]={}
In[12]:=Solve[(9999999999999./10000000000000)^x == .5, x]
Out[12]={{x -> 6.937016409072274`*^12}}
Skirmantas
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