# I Havil's book "Gamma" page 57, formula

1. Jun 9, 2017

### Lapidus

Where does the 1 in the last line come from?

Thank you!

2. Jun 9, 2017

### Staff: Mentor

Looks like the last sum should start at $1$, which I guess would be important when integration by parts is used. The term for $r=0$ is somehow special and can be treated separately. Probably a copy+paste error.