Abstract David Kuridze, Lyndsay Fletcher and Hugh Hudson report on the RAS Specialist Discussion Meeting ‘3D Structure of Flare Chromosphere’.

During his twenty-two years at Yale, Hugh Long has provided leadership as chairman of three departments (physiological chemistry, phar-macology and physiology), as dean, and as chairman of the division of biological sciences of the University, but even this unparalleled record of academic versatility and productivity reflects only a small part of his achievement. four years he came to Yale as P...

We show that a certain orbit category considered by Keller encodes the combinatorics of the m-clusters of Fomin and Reading in a fashion similar to the way the cluster category of Buan, Marsh, Reineke, Reiten, and Todorov encodes the combinatorics of the clusters of Fomin and Zelevinsky. This allows us to give type-uniform proofs of certain results of Fomin and Reading in the simply laced cases...