A couple come to mind * The proof of the classification of simple groups[0] * The work on topological four manifolds by M. Freedman [1] [0]: https://en.m.wik

A couple come to mind * The proof of the classification of simple groups[0] * The work on topological four manifolds by M. Freedman [1] [0]: https://en.m.wikipedia.org/wiki/Classification_of_finite_simple_groups https://en.m.wikipedia.org/wiki/Classification_of_finite_sim... [1]: https://news.ycombinator.com/item?id=28471159 https://news.ycombinator.com/item?id=28471159