
theorem Th753:
Sum digits(286,10) = 16
proof
  thus Sum digits(286,10) = Sum <%6,8%>+Sum <%2%> by Th752,AFINSQ_2:55
  .= (6 + 8) + Sum <%2%> by AFINSQ_2:54
  .= 14 + 2 by AFINSQ_2:53
  .= 16;
end;
