This figure shows a map from Whately’s ‘Elements of logic’. Details are different from the argument maps used in this course. However, the basic hierarchical structure is similar. There is a main claim at the top level, in this case ‘[Ultimate Conclusion.] Z is X proved by’. This is connected to two supporting claims: ‘Y is proved by’ and ‘Z is Y, proved by’. These claims are supported by further claims. For our purposes, the details of Whately’s map do not matter.