“…We point out that in this work, we choose to employ our preference models as opposed to Grove's Systems of Spheres to study belief and its changes. The reason for this is that, firstly, preference-like models are more general structures and have been extensively studied as models for non-monotonic reasoning, conditional logics, and mental attitudes, as variant notions of belief [17,18,19,20,21,8]. By employing these models to study belief change operators, we may generalise our results and the insights obtained with our study to change operations for other mental attitudes and diverse dynamic phenomena.…”