
theorem Th1198:
Sum digits(2350,10) = 10
proof
  thus Sum digits(2350,10) = Sum <%0,5,3%>+Sum <%2%> by Th1197,AFINSQ_2:55
  .= Sum <%0,5%> + Sum <%3%> + Sum <%2%> by AFINSQ_2:55
  .= (0 + 5) + Sum <%3%> + Sum <%2%> by AFINSQ_2:54
  .= (0 + 5 + 3) + Sum <%2%> by AFINSQ_2:53
  .= 8 + 2 by AFINSQ_2:53
  .= 10;
end;
