Grothendieck universe
= Grothendieck universe
{wiki=Grothendieck_universe}
A Grothendieck universe is a concept in set theory used primarily in category theory and algebraic geometry, named after the mathematician Alexander Grothendieck. It provides a way to work with large sets while avoiding certain foundational issues, like those that arise from Russell's paradox. The concept facilitates the rigorous treatment of categories and functors.