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March 13th, 2012, 10:53 PM  #1 
Newbie Joined: Feb 2012 Posts: 20 Thanks: 0  Why can a function be expressed as a Taylor Series?
Where can I see proof for this? Also a few "simple" deductions (cos idk yet) of most simple Taylor series (cos x, sin x, e^x, etc). A book with a straightforward explanation or something like that. tks in advance peter 
March 14th, 2012, 01:56 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,378 Thanks: 542  Re: Why can a function be expressed as a Taylor Series?
Some functions can and some cannot. The concept of analytic function is what you need to understand. http://en.wikipedia.org/wiki/Analytic_function 

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