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Aug 20, 2016 at 19:33 comment added user42690 the first is a special case of the second one, i.e. if U = T(M) , Lie U=\hat M. And exponential is used essentially in proving the functoriality of Univ Gp Ext, see 2.4, chap 4 of Messing.
Mar 19, 2016 at 0:34 review First posts
Mar 19, 2016 at 0:36
Mar 7, 2016 at 9:43 history asked user87766 CC BY-SA 3.0