Dear Alexandre: I am trying to figure out whether SPOT can accept boolean assertions such as "x >1". For example, can SPOT recognize the LTL formula F (x > 1), which is accepted by Promela format? I tried it with SPOT by ./ltl2tgba -f "F (x>1)" and SPOT fails to parse it. But I really want to make sure whether I have used it correctly. Many thanks~ -- Best Regards Jianwen Li