
theorem Th183:
Sum digits(64,10) = 10
proof
  thus Sum digits(64,10) = Sum <%4%>+Sum <%6%> by Th182,AFINSQ_2:55
  .= 4 + Sum <%6%> by AFINSQ_2:53
  .= 4+6 by AFINSQ_2:53
  .= 10;
end;
