Harmonic Series is Divergent/Historical Note
Historical Note on Harmonic Series is Divergent
The proof that the Harmonic Series is Divergent was discovered by Nicole Oresme.
However, it was lost for centuries, before being rediscovered by Pietro Mengoli in $1647$.
It was discovered yet again in $1687$ by Johann Bernoulli, and a short time after that by Jakob II Bernoulli, after whom it is usually (erroneously) attributed.
Some sources attribute its rediscovery to Jacob Bernoulli.
Sources
- 1992: George F. Simmons: Calculus Gems ... (previous) ... (next): Chapter $\text {A}.20$: The Bernoulli Brothers