Can I have an explanation regarding the notation "e" used here? Thank you :-)image link is in the below...]1
Can I have an explanation please??
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sequences-and-series
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0They just changed index of summation and use Taylor series. – 2017-01-08
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1This exact question was asked yesterday and was put off hold because it was lacking context. Can you provide some more context and explain where you are stuck? http://math.stackexchange.com/questions/2085766/how-to-prove-this-series-problem-sum-r-1-infty-fracr12r-5e-1 – 2017-01-08
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0@ElliotG : It is a considerable stretch to say that that is this exact question. – 2017-01-08
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0@MichaelHardy true but it appears to be the same person who keeps asking about this problem and they could have asked for clarification on the original post. – 2017-01-08
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0I could be wrong though. – 2017-01-08
1 Answers
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The number $e$ is the base of the natural exponential and natural logarithmic functions, which is $$ e = \sum_{n=0}^\infty \frac 1 {n!} \approx 2.71828182846\ldots $$