begin
theorem Th1:
theorem Th2:
theorem
theorem
theorem Th5:
theorem Th6:
theorem Th7:
theorem Th8:
theorem Th9:
theorem Th10:
begin
theorem Th11:
:: deftheorem defines CongrCl MSUALG_8:def 1 :
:: deftheorem defines CongrCl MSUALG_8:def 2 :
theorem
theorem
theorem
theorem
theorem Th16:
:: deftheorem Def3 defines EqRelSet MSUALG_8:def 3 :
theorem Th17:
theorem Th18:
theorem Th19:
theorem Th20: