
theorem Th924:
Sum digits(46,10) = 10
proof
  thus Sum digits(46,10) = Sum <%6%>+Sum <%4%> by Th923,AFINSQ_2:55
  .= 6 + Sum <%4%> by AFINSQ_2:53
  .= 6+4 by AFINSQ_2:53
  .= 10;
end;
