
theorem Th595:
Sum digits(2660,10) = 14
proof
  thus Sum digits(2660,10) = Sum <%0,6,6%>+Sum <%2%> by Th594,AFINSQ_2:55
  .= Sum <%0,6%> + Sum <%6%> + Sum <%2%> by AFINSQ_2:55
  .= (0 + 6) + Sum <%6%> + Sum <%2%> by AFINSQ_2:54
  .= (0 + 6 + 6) + Sum <%2%> by AFINSQ_2:53
  .= 12 + 2 by AFINSQ_2:53
  .= 14;
end;
