In mathematics, sum of all natural number is infinity.

but Ramanujan suggests whole new definition of summation.

"The sum of $n$ is $-1/12$" what so called Ramanujan Summation.

First he find the sum, only Hardy recognized the value of the summation.

And also in quantum mechanics(I know), Ramanujan summation is very important.

**Question.** What is the value of Ramanujan summation in quantum mechanics?

This post imported from StackExchange Physics at 2014-03-17 04:00 (UCT), posted by SE-user 4545454545SI