 The core structure of an obligational disputation is closely similar to what we find from Plato’s dialogues. In a so-called Socratic elenchus Socrates is putting forward questions, and most of them can be and are answered by ‘yes’ or by ‘no’. The sequence of questions in effect builds up an argument leading to a situation where the person responding to Socrates’ questions is often forced to admit the opposite of what was put as a starting point in the dialectical encounter. As a core background assumption, the person answering has to grant to Socrates some propositions because of other propositions that he has already granted. In a somewhat implicit form, the obligational principle that whatever follows needs to be granted is thus present already in the Socratic elenchus. (See e.g., Robinson 1953)