
theorem Th950:
Sum digits(345,10) = 12
proof
  thus Sum digits(345,10) = Sum <%5,4%>+Sum <%3%> by Th949,AFINSQ_2:55
  .= (5 + 4) + Sum <%3%> by AFINSQ_2:54
  .= 9 + 3 by AFINSQ_2:53
  .= 12;
end;
