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roundfunction: it doesn't callparentroundon a sub-term ofe, but directly one. I don't think this is allowed.roundinc, the call toround yis not decreasing, it should be something likeround lwheree = node lroundis called from withinroundswhere the sub-term ofe(which ish) is passed (renamingeinroundmakes no difference). When it is called from withinroundinc, as you pointed it out,yis not decreasing. Actually, the real function is using a complex predicatestronglyseeonyande, which include thatyis a sub-event ofe. The problem now, in addition, is: even if we include that predicate inroundinc, Coq does not understand automatically, thatyis indeed a sub-term ofe.