Each Masterclass focuses on a different exam board (AQA or OCR A) and year group, allowing for detailed guidance and support. Participants can access video recordings of each class for later revision. The topic-based group lessons include explanations and exam-question walk-throughs. I discuss ...
Throughout this paper we work with binary unrooted trees on n leaves labeled {1, ..., n}. Such trees are also known as phylogenetic X-trees. We refer the reader to [10] for more detail about such trees, and for related definitions. Recall there are 2n - 3 edges in an unrooted tre...