Difference between revisions of "Taylor Series"

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(New Concept: Taylor Series)
(New Concept: Taylor Series)
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:<math> \sum_{n=0} ^ {\infin } \frac {f^{(n)}(a)}{n!} \, (x-a)^{n}</math>
 
:<math> \sum_{n=0} ^ {\infin } \frac {f^{(n)}(a)}{n!} \, (x-a)^{n}</math>
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* '''Convergence:'''  A function whose Taylor series converges to the function is called ''analytic''.  But sometimes, as we have seen with power series generally, convergence can be local (i.e. only in some interval).

Revision as of 21:59, 14 March 2011

Review Concepts

  • Sequences
  • Convergence
  • Infinite series
  • The sequence of partial sums of an infinite series
  • Power series

New Concept: Taylor Series

  • Think of Taylor series as a special kind of power series, where the sequence of partial sums are meant as better and better approximations of some other function.
  • The Taylor Series is derived from the function.

Definition copied, verified, and adapted from Wikipedia, this page (permanent link). See license to copy, modify, distribute.

The Taylor series of a function ƒ(x) at a is the power series

f(a)+\frac {f'(a)}{1!} (x-a)+ \frac{f''(a)}{2!} (x-a)^2+\frac{f^{(3)}(a)}{3!}(x-a)^3+ \cdots.

which can be written in the more compact sigma notation as

 \sum_{n=0} ^ {\infin } \frac {f^{(n)}(a)}{n!} \, (x-a)^{n}
  • Convergence: A function whose Taylor series converges to the function is called analytic. But sometimes, as we have seen with power series generally, convergence can be local (i.e. only in some interval).