. our choices will inevitably be related to how we see the topic and how we think our students will itbest, but the also prompt us to starting. a particular topic is, consider other ways of For, important as even more important is inducting students into a mathematical way of thinking, and this requires facility and familiarity with all of these different aspects. Furthermore, the variety different aspects makes it possible to introduce freshness of approach with fresh topics or with old topics that require further work.