 Within a university disputation, what counted as a “true” answer depended on the rules of the particular sort of disputation. In a dialectical one, the respondent should only grant a proposition if it is probable; in that context, granting an improbable proposition amounts to speaking untruly (mentiri) even if in reality it is as the proposition states (Quaest. Top., 139). The analogous situation within a specific science is granting a proposition that is at odds with the principles of the science in case. It is a fundamental principle of (Aristotelian) physics that every movement presupposes a previous movement, hence the claim that there once was a first movement must count as false in physics.