# Examples of obscure categorical data type
# which are not computable in the sense of CPL.

# the left adjoint functor of the list functor
left object ladjlist(X) with psi is
  a: X -> list(ladjlist)
end object;

# the right adjoint functor of the list functor
right object radjlist(X) with psi' is
  a': list(radjlist) -> X
end object;