show/hide this revision's text 2 copy edit title

When does do infinitesimal deformations lift to global deformationdeformations?

show/hide this revision's text 1

When does infinitesimal deformations lift to global deformation

Hi, I understand the notion of Infinitesimal and global deformations and the fact that global deformations lead to certain infinitesimal deformations. But I could not find any criterion or idea to understand when an infinitesimal deformation cannot be lifted to a global deformation.