
theorem Th565:
Sum digits(2360,10) = 11
proof
  thus Sum digits(2360,10) = Sum <%0,6,3%>+Sum <%2%> by Th564,AFINSQ_2:55
  .= Sum <%0,6%> + Sum <%3%> + Sum <%2%> by AFINSQ_2:55
  .= (0 + 6) + Sum <%3%> + Sum <%2%> by AFINSQ_2:54
  .= (0 + 6 + 3) + Sum <%2%> by AFINSQ_2:53
  .= 9 + 2 by AFINSQ_2:53
  .= 11;
end;
