Todo

edit
  • define morphisms between them
  • give examples of morphisms and non-isomorphic extensions
  • show module structure for exal
  • define exal for schemes
  • add explanation of composition of exal groups with the module formed by a direct sum of dual numbers, giving  

Confusion in section "Relation with the cotangent complex"

edit

I think there is a mistake here. The correct statement should be

 .

Illusie, in [1], uses   instead of Grothendieck's  .

None of the original French texts use  , they write   (EGA IV) or   (Illusie).

Amyekut (talk) 10:32, 11 March 2023 (UTC)Reply