
theorem Th110:
Sum digits(65,10) = 11
proof
  thus Sum digits(65,10) = Sum <%5%>+Sum <%6%> by Th109,AFINSQ_2:55
  .= 5 + Sum <%6%> by AFINSQ_2:53
  .= 5+6 by AFINSQ_2:53
  .= 11;
end;
