alt Hacker NewsIn 2012 Mochizuki claimed to have proved the abc conjecture by developing a new branch of mathematics. He was a respected mathematician, but the theories he had developed were so complex no one could determine if he was correct. It took six years until two number theorists dissected the proof and found a fatal flaw in it.
Mochizuki and a group of mathematicians still claim that Stix and Scholze didn't actually identify a flaw and his proof was published in a journal (where Mochizuki is the chief editor and the reviewers were people from Mochizuki's instituion). I think most of the math community don't believe his proof although Mochizuki and some others claim it's valid.