begin
theorem
canceled;
theorem Th2:
theorem Th3:
theorem Th4:
:: deftheorem Def1 defines lower WELLFND1:def 1 :
theorem Th5:
theorem Th6:
begin
:: deftheorem Def2 defines well_founded WELLFND1:def 2 :
:: deftheorem Def3 defines well_founded WELLFND1:def 3 :
:: deftheorem Def4 defines well_founded-Part WELLFND1:def 4 :
theorem Th7:
theorem Th8:
theorem Th9:
theorem Th10:
theorem Th11:
:: deftheorem Def5 defines is_recursively_expressed_by WELLFND1:def 5 :
theorem
theorem
theorem
:: deftheorem WELLFND1:def 6 :
canceled;
:: deftheorem Def7 defines descending WELLFND1:def 7 :
theorem