
theorem Th126:
Sum digits(195,10) = 15
proof
  thus Sum digits(195,10) = Sum <%5,9%>+Sum <%1%> by Th125,AFINSQ_2:55
  .= (5 + 9) + Sum <%1%> by AFINSQ_2:54
  .= 14 + 1 by AFINSQ_2:53
  .= 15;
end;
