### This German retiree solved one of world's most complex maths problems - and no one noticed

Published by adjectivesscience on

It's a problem that the world's most experienced mathematicians have spent decades trying to solve, and the solution had eluded them at every turn - the infamous Gaussian correlation inequality (GCI).

Then, out of nowhere, a retired German statistician figured out the proof while hunched over the sink, cleaning his teeth. But rather than being celebrated by the wider mathematical community, the proof went largely ignored. Because how could such an unlikely figure have outsmarted them all?