
theorem Th415:
Sum digits(860,10) = 14
proof
  thus Sum digits(860,10) = Sum <%0,6%>+Sum <%8%> by Th414,AFINSQ_2:55
  .= (0 + 6) + Sum <%8%> by AFINSQ_2:54
  .= 6 + 8 by AFINSQ_2:53
  .= 14;
end;
