session LCF = Pure +
  description {*
    Author:     Tobias Nipkow
    Copyright   1992  University of Cambridge
  *}
  options [document = false]
  theories LCF

session "LCF-ex" in ex = LCF +
  description {*
    Author:     Tobias Nipkow
    Copyright   1991  University of Cambridge

    Some examples from Lawrence Paulson's book Logic and Computation.
  *}
  options [document = false]
  theories
    Ex1
    Ex2
    Ex3
    Ex4

