
theorem Th187:
Sum digits(128,10) = 11
proof
  thus Sum digits(128,10) = Sum <%8,2%>+Sum <%1%> by Th186,AFINSQ_2:55
  .= (8 + 2) + Sum <%1%> by AFINSQ_2:54
  .= 10 + 1 by AFINSQ_2:53
  .= 11;
end;
