
theorem Th232:
Sum digits(102,10) = 3
proof
  thus Sum digits(102,10) = Sum <%2,0%>+Sum <%1%> by Th231,AFINSQ_2:55
  .= (2 + 0) + Sum <%1%> by AFINSQ_2:54
  .= 2 + 1 by AFINSQ_2:53
  .= 3;
end;
