
theorem Th1100:
Sum digits(650,10) = 11
proof
  thus Sum digits(650,10) = Sum <%0,5%>+Sum <%6%> by Th1099,AFINSQ_2:55
  .= (0 + 5) + Sum <%6%> by AFINSQ_2:54
  .= 5 + 6 by AFINSQ_2:53
  .= 11;
end;
