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Unformatted text preview: Functions as Power Series. Last time we began the study of Power Series and the values for which they converge. In summary, we looked at the function f ( x ) = ∞ X k =0 a k ( x a ) k and asked, “what is the domain of this function?”. The answer was, every x that is inside the interval of convergence for this power series. Math 9C Summer 2011 (UCR) ProNotes October 24, 2011 1 / 1 For some power series, we saw there was only one x which the power series converged (This was x = a ). For other we saw that it could be an interval of the form ( a R , a + R ) or even the entire real line (∞ , ∞ ). So now we ask: if we define the function f ( x ) = ∞ X k =0 a k ( x a ) k , have we ever seen this function before? For some power series the answer is a partial yes. Our first example of a power series was the geometric series ∞ X k =0 x k we know this power series has an interval of convergence ( 1 , 1). Math 9C Summer 2011 (UCR) ProNotes October 24, 2011 2 / 1 If we define the function f ( x ) = ∞ X k =0 x k , then the domain of this function is ( 1 , 1). But we can do better, we know that when 1 < x < 1, ∞ X k =0 x k = 1 1 x . Something to think about: We can put 2 into the right side of this equation, but we can’t put 2 into the left side of this equation. So thisequation, but we can’t put 2 into the left side of this equation....
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This note was uploaded on 02/22/2012 for the course MATH 9c taught by Professor C during the Fall '11 term at UC Riverside.
 Fall '11
 c
 Power Series

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