It seems strange?+x+x .(x times)=x^2 then x=2x(differentiate wrt x)?

  • Thread starter vkash
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  • #1
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Main Question or Discussion Point

It seems strange?+x+x.....(x times)=x^2 then x=2x(differentiate wrt x)?

x+x=2x
x+x+x=3x
x+x+x+x=4x
................
x+x+x+x+x+x+...(n times)=nx
x+x+x+x+x+x+...(x times)=x*x=x2
differentiate both sides with respect to x;
1+1+1+1+1+1...(x times)=2x
x=2x(what is it?)
what's wrong????
 

Answers and Replies

  • #2
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Saying x+x+x+x+x+x+...+x (x times) simply makes no sense. It only makes sense if x is a natural number.

What, for example, is

[tex]\sqrt{2}+\sqrt{2}+...+\sqrt{2}~~(\sqrt{2}~ \text{times})[/tex]

The expression makes no sense.

It only makes sense for natural numbers. And if the domain is only the natural numbers, then we can take no derivative.
 
  • #3
318
1


Saying x+x+x+x+x+x+...+x (x times) simply makes no sense. It only makes sense if x is a natural number.

What, for example, is

[tex]\sqrt{2}+\sqrt{2}+...+\sqrt{2}~~(\sqrt{2}~ \text{times})[/tex]

The expression makes no sense.

It only makes sense for natural numbers. And if the domain is only the natural numbers, then we can take no derivative.
Wow fantastic...
If domain is natural number then the curve will not remain continous and their is nothing like derivative for such function.
thanks....
 

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