
theorem Th954:
Sum digits(483,10) = 15
proof
  thus Sum digits(483,10) = Sum <%3,8%>+Sum <%4%> by Th953,AFINSQ_2:55
  .= (3 + 8) + Sum <%4%> by AFINSQ_2:54
  .= 11 + 4 by AFINSQ_2:53
  .= 15;
end;
