introduced Auto Nitpick in addition to Auto Quickcheck;
this required generalizing the theorem hook used by Quickcheck,
following a suggestion by Florian
header {* Main HOL *}
theory Main
imports Plain Nitpick
begin
text {*
Classical Higher-order Logic -- only ``Main'', excluding real and
complex numbers etc.
*}
text {* See further \cite{Nipkow-et-al:2002:tutorial} *}
end