
theorem Th934:
Sum digits(161,10) = 8
proof
  thus Sum digits(161,10) = Sum <%1,6%>+Sum <%1%> by Th933,AFINSQ_2:55
  .= (1 + 6) + Sum <%1%> by AFINSQ_2:54
  .= 7 + 1 by AFINSQ_2:53
  .= 8;
end;
