
theorem Th1076:
Sum digits(25,10) = 7
proof
  thus Sum digits(25,10) = Sum <%5%>+Sum <%2%> by Th1075,AFINSQ_2:55
  .= 5 + Sum <%2%> by AFINSQ_2:53
  .= 5+2 by AFINSQ_2:53
  .= 7;
end;
