
theorem Th1118:
Sum digits(950,10) = 14
proof
  thus Sum digits(950,10) = Sum <%0,5%>+Sum <%9%> by Th1117,AFINSQ_2:55
  .= (0 + 5) + Sum <%9%> by AFINSQ_2:54
  .= 5 + 9 by AFINSQ_2:53
  .= 14;
end;
