English Kai Behrend Cited by user Grimes2 on 17 Dec 2021 Kai Behrend is a German mathematician. He is a professor at the University of British Columbia in Vancouver, British Columbia, Canada.
English Group-stack Cited by user TakuyaMurata on 25 Jul 2017 In algebraic geometry, a group-stack is an algebraic stack whose sets of points have group structures.
English Cone (algebraic geometry) Cited by user TakuyaMurata on 20 Jul 2017 In algebraic geometry, a cone is a generalization of a vector bundle. Specifically, given a scheme X, the relative Spec
English Normal cone Cited by user TakuyaMurata on 20 Jul 2017 In algebraic geometry, the normal cone of a subscheme of a scheme is a scheme analogous to the normal bundle or tubular neighborhood in differential geometry.
English Perfect obstruction theory Cited by user TakuyaMurata on 19 Jul 2017 In algebraic geometry, given a Deligne–Mumford stack X, a perfect obstruction theory for X consists of an object E in the derived category of quasi-coherent sheaves on X…