Cauchy’s main work was under 200 years ago; and there’s been quite a lot of work since. Again, I’m unsure that calculus existed at sufficient level 200 years a

Cauchy’s main work was under 200 years ago; and there’s been quite a lot of work since. Again, I’m unsure that calculus existed at sufficient level 200 years ago — it didn’t appear in modern form from either Leibniz or Newton.