
theorem Th763:
Sum digits(484,10) = 16
proof
  thus Sum digits(484,10) = Sum <%4,8%>+Sum <%4%> by Th762,AFINSQ_2:55
  .= (4 + 8) + Sum <%4%> by AFINSQ_2:54
  .= 12 + 4 by AFINSQ_2:53
  .= 16;
end;
