
theorem Th387:
Sum digits(560,10) = 11
proof
  thus Sum digits(560,10) = Sum <%0,6%>+Sum <%5%> by Th386,AFINSQ_2:55
  .= (0 + 6) + Sum <%5%> by AFINSQ_2:54
  .= 6 + 5 by AFINSQ_2:53
  .= 11;
end;
