- #1

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sum_{r=0}^{+\infty}1/(r*r!)

It looks a bit like e^1 but the extra r in the denominator is causing problems. Can anyone help?

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- Thread starter mathsnerd
- Start date

- #1

- 2

- 0

sum_{r=0}^{+\infty}1/(r*r!)

It looks a bit like e^1 but the extra r in the denominator is causing problems. Can anyone help?

- #2

- 761

- 13

Where does this problem originates from?

- #3

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