
theorem Th340:
Sum digits(703,10) = 10
proof
  thus Sum digits(703,10) = Sum <%3,0%>+Sum <%7%> by Th339,AFINSQ_2:55
  .= (3 + 0) + Sum <%7%> by AFINSQ_2:54
  .= 3 + 7 by AFINSQ_2:53
  .= 10;
end;
