
theorem Th746:
Sum digits(378,10) = 18
proof
  thus Sum digits(378,10) = Sum <%8,7%>+Sum <%3%> by Th745,AFINSQ_2:55
  .= (8 + 7) + Sum <%3%> by AFINSQ_2:54
  .= 15 + 3 by AFINSQ_2:53
  .= 18;
end;
