Alistair Savage is speaking in the Algebra Seminar this week. We will go out for lunch at the Royal Hotel in Darlington after the talk. When: Friday 26 May, 12-1pm Where: Carslaw 173 Title: Diagram Weaving Abstract: We will explain how one can construct diagrammatic presentations of categories of representations of Lie groups and their associated quantum groups using only a small amount of information about these categories. To illustrate the technique in concrete terms, we will focus on the exceptional Lie group of type F4.