Today’s entry is a Theorem of the Day:
The Basel Problem:
Originally posed in the 1640s, the value of this series was unknown until 1734 when it was solved by Euler. Many beautiful proofs exist; for some examples and more information, see the full listing at Theorem of the Day: the Basel Problem.
This is part of the Aperiodical Advent Calendar. We’ll be posting a new surprise for you each morning until Christmas!
At least one third of the editorial board of this website does not approve of the use of in the equation above.