
theorem Th740:
Sum digits(273,10) = 12
proof
  thus Sum digits(273,10) = Sum <%3,7%>+Sum <%2%> by Th739,AFINSQ_2:55
  .= (3 + 7) + Sum <%2%> by AFINSQ_2:54
  .= 10 + 2 by AFINSQ_2:53
  .= 12;
end;
