
theorem Th1086:
Sum digits(275,10) = 14
proof
  thus Sum digits(275,10) = Sum <%5,7%>+Sum <%2%> by Th1085,AFINSQ_2:55
  .= (5 + 7) + Sum <%2%> by AFINSQ_2:54
  .= 12 + 2 by AFINSQ_2:53
  .= 14;
end;
