
theorem Th1252:
Sum digits(3250,10) = 10
proof
  thus Sum digits(3250,10) = Sum <%0,5,2%>+Sum <%3%> by Th1251,AFINSQ_2:55
  .= Sum <%0,5%> + Sum <%2%> + Sum <%3%> by AFINSQ_2:55
  .= (0 + 5) + Sum <%2%> + Sum <%3%> by AFINSQ_2:54
  .= (0 + 5 + 2) + Sum <%3%> by AFINSQ_2:53
  .= 7 + 3 by AFINSQ_2:53
  .= 10;
end;
