Basic deformation theory of smooth formal schemes
Abstract
We provide the main results of a deformation theory of smooth formal schemes. First we deal with the case of global lifting of smooth morphisms. We prove that the obstruction to the existence of a global lifting lies in a Ext1 group. Then we study uniqueness and existence of lifting of smooth formal schemes. The set of isomorphism classes of smooth liftings is classified by a Ext1 group and there exists an obstruction in a Ext2 group whose vanishing characterizes the existence of smooth liftings.
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