1+2+3+4+… = -1/12, Ramanujan's Sum 📺

By Xah Lee. Date: . Last updated: .

1+2+3+4+... = -1/12 wow. How is it possible?

that's called Ramanujan's sum.

you can learn it from the first 15 min of John Baez's lecture

John Baez's on number 24. (quantum mechanics, string theory)

this is quite amazing, touching on several things. See:

zeta function plot
a plot of the zeta function

on a separate note, the rest of Baez's video is also extremely interesting. It introduces you to concepts of string theory, quantum mechanics, spinor theory. See: John Baez on Octonion 📺