begin
theorem
theorem Th8:
theorem Th9:
theorem Th10:
theorem Th11:
theorem Th12:
theorem Th13:
theorem Th14:
theorem Th15:
theorem Th16:
theorem Th17:
theorem
theorem Th19:
theorem Th20:
theorem Th21:
theorem
theorem Th23:
theorem Th24:
theorem
theorem
theorem
theorem
theorem
theorem Th30:
theorem
theorem Th32:
theorem