
theorem Th742:
Sum digits(294,10) = 15
proof
  thus Sum digits(294,10) = Sum <%4,9%>+Sum <%2%> by Th741,AFINSQ_2:55
  .= (4 + 9) + Sum <%2%> by AFINSQ_2:54
  .= 13 + 2 by AFINSQ_2:53
  .= 15;
end;
