
theorem Th1196:
Sum digits(2325,10) = 12
proof
  thus Sum digits(2325,10) = Sum <%5,2,3%>+Sum <%2%> by Th1195,AFINSQ_2:55
  .= Sum <%5,2%> + Sum <%3%> + Sum <%2%> by AFINSQ_2:55
  .= (5 + 2) + Sum <%3%> + Sum <%2%> by AFINSQ_2:54
  .= (5 + 2 + 3) + Sum <%2%> by AFINSQ_2:53
  .= 10 + 2 by AFINSQ_2:53
  .= 12;
end;
