
theorem Th1106:
Sum digits(750,10) = 12
proof
  thus Sum digits(750,10) = Sum <%0,5%>+Sum <%7%> by Th1105,AFINSQ_2:55
  .= (0 + 5) + Sum <%7%> by AFINSQ_2:54
  .= 5 + 7 by AFINSQ_2:53
  .= 12;
end;
