1+2+3+4+... = -1/12 ??

I’ve been geeking out on some interesting math lately, and on my travels came across this statement “1+2+3+4+… = -1/12, which on first account I thought, what is this B.S??

Well, despite the actual proof looking like mathematical “hackery” remarkably this is actually a valid solution which is justified because it appears in practice - namely in physics.

If you’re interested in the proof you can go ahead and watch it here.