By Grothendieck's standards, there are a surprising number of important practical applications. "Grothendieck's Theorem, past and present" https://arxiv.org/a

By Grothendieck's standards, there are a surprising number of important practical applications. "Grothendieck's Theorem, past and present" https://arxiv.org/abs/1101.4195 https://arxiv.org/abs/1101.4195