
theorem Th1342:
Sum digits(4550,10) = 14
proof
  thus Sum digits(4550,10) = Sum <%0,5,5%>+Sum <%4%> by Th1341,AFINSQ_2:55
  .= Sum <%0,5%> + Sum <%5%> + Sum <%4%> by AFINSQ_2:55
  .= (0 + 5) + Sum <%5%> + Sum <%4%> by AFINSQ_2:54
  .= (0 + 5 + 5) + Sum <%4%> by AFINSQ_2:53
  .= 10 + 4 by AFINSQ_2:53
  .= 14;
end;
