
theorem Th124:
Sum digits(182,10) = 11
proof
  thus Sum digits(182,10) = Sum <%2,8%>+Sum <%1%> by Th123,AFINSQ_2:55
  .= (2 + 8) + Sum <%1%> by AFINSQ_2:54
  .= 10 + 1 by AFINSQ_2:53
  .= 11;
end;
