new attribute "arith" for facts supplied to arith.
header {* Main HOL *}
theory Main
imports Plain Code_Eval Map Nat_Int_Bij Recdef SAT
begin
text {*
Classical Higher-order Logic -- only ``Main'', excluding real and
complex numbers etc.
*}
text {* See further \cite{Nipkow-et-al:2002:tutorial} *}
end