
theorem Th996:
Sum digits(1058,10) = 14
proof
  thus Sum digits(1058,10) = Sum <%8,5,0%>+Sum <%1%> by Th995,AFINSQ_2:55
  .= Sum <%8,5%> + Sum <%0%> + Sum <%1%> by AFINSQ_2:55
  .= (8 + 5) + Sum <%0%> + Sum <%1%> by AFINSQ_2:54
  .= (8 + 5 + 0) + Sum <%1%> by AFINSQ_2:53
  .= 13 + 1 by AFINSQ_2:53
  .= 14;
end;
