anchor.diff:  been investigating how to add native inductive types to the Calculus
   of Constructions, in the manner of Per Martin-Löf's Intuitionistic
   Type Theory. The impredicative encoding had already been presented in:
  -F. Pfenning and C. Paulin-Mohring. _Inductively defined types in the
  -Calculus of Constructions_. Preprint technical report CMU-CS-89-209,
  -final version in Proceedings of Mathematical Foundations of
  -Programming Semantics, volume 442, Lecture Notes in Computer
  -Science. Springer-Verlag, 1990.  An extension of the calculus with
  -primitive inductive types appeared in: Th. Coquand and
  -C. Paulin-Mohring. _Inductively defined types_.  In P. Martin-Löf and
  -G. Mints, editors, Proceedings of Colog'88, volume 417, Lecture Notes
  -in Computer Science. Springer-Verlag, 1990.
  +F. Pfenning and C. Paulin-Mohring. __Inductively defined types in the
  +Calculus of Constructions__ <<PP90>>. An extension of the calculus
  +with primitive inductive types appeared in: Th. Coquand and
  +C. Paulin-Mohring. __Inductively defined types__ <<CP90>>.
   
   This led to the Calculus of Inductive Constructions, logical formalism
   implemented in Versions 5 upward of the system, and documented in:
  -C. Paulin-Mohring. _Inductive Definitions in the System Coq - Rules
  -and Properties_. In M. Bezem and J.-F. Groote, editors, Proceedings of
  -the conference Typed Lambda Calculi and Applications, volume 664,
  -Lecture Notes in Computer Science, 1993.
  +C. Paulin-Mohring. __Inductive Definitions in the System Coq - Rules
  +and Properties__ <<P93>>.
   
   The last version of CONSTR is Version 4.11, which was last distributed
   in the spring of 1990. It was demonstrated at the first workshop of
  
positive.code: ====
  September 2015 +
  Thierry Coquand, Gérard Huet and Christine Paulin-Mohring.
  ====
negative.code: synthesis of implicit type arguments, relieving the user of tedious
  redundant declarations.
  
  Christine Paulin wrote an article __Algorithm development in the
  Calculus of Constructions__ <<P86>>. Besides _lambo_ and _majority_,
  she presents quicksort and a text formatting algorithm.
  
  Version 2.13 of the Calculus of Constructions with universes was
  frozen on June 25th, 1986.
  