1. Nov 13, 2011 #1

   fluidistic

   

   Gold Member

   My friend came up with the following:
   [itex]2x=1 \Rightarrow \frac{d}{dx}(2x)=\frac{d}{dx}1 \Rightarrow 2=0[/itex]. Shamefully I do not see what's wrong with this reasoning!
   Can someone help me? :)

    

   fluidistic, Nov 13, 2011
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3. Nov 13, 2011 #2

   LCKurtz

   

   Science Advisor

   Homework Helper

   Gold Member

   2x=1 is not an identity. It is only true for x = 1/2.

    

   LCKurtz, Nov 13, 2011
4. Nov 13, 2011 #3

   fluidistic

   

   Gold Member

   Thank you LcKurtz, that makes sense.

    

   fluidistic, Nov 13, 2011

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