
theorem Th37:
Sum digits(110,10) = 2
proof
  thus Sum digits(110,10) = Sum <%0,1%>+Sum <%1%> by Th36,AFINSQ_2:55
  .= (0 + 1) + Sum <%1%> by AFINSQ_2:54
  .= 1 + 1 by AFINSQ_2:53
  .= 2;
end;
