Simple to say but hard to solve

https://sh.itjust.works/post/3005097

Simple to say but hard to solve - sh.itjust.works

(Inspired by Reddit post of the last month)

It’s merely a slightly longer sum, so what’s the problem?
I get the feeling you haven’t solved many.
I mean they’re right, Leibniz used a modified s for summa, sum. And an integral is just a sum, an infinite sum over infinitesimal summands, but a sum nevertheless.
Yes, they are right about that being the general concept. I only take issue with the implication that it’s equally simple.