session Sequents! in "." = Pure +
  description {*
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1991  University of Cambridge

    Classical Sequent Calculus based on Pure Isabelle.
  *}
  options [document = false]
  theories
    LK
    ILL
    ILL_predlog
    Washing
    Modal0
    T
    S4
    S43

session LK = Sequents +
  description {*
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1992  University of Cambridge

    Examples for Classical Logic.
  *}
  options [document = false]
  theories
    Propositional
    Quantifiers
    Hard_Quantifiers
    Nat

