Definition: In this task, you are given a part of an article. Your task is to generate headline (title) for this text. Preferred headlines are under fifteen words.
Input: The AGM theory of belief revision has be­ come an important paradigm for investigat­ ing rational belief changes. Unfortunately, researchers working in this paradigm have re­ stricted much of their attention to rather sim­ ple representations of belief states, namely logically closed sets of propositional sen­ tences. In our opinion, this has resulted in a too abstract categorisation of belief change operations: expansion, revision, or contrac­ tion. Occasionally, in the AGM paradigm, also probabilistic belief changes have been considered, and it is widely accepted that the probabilistic version of expansion is con­ ditioning. However, we argue that it may be more correct to view conditioning and expan­ sion as two essentially different kinds of belief change, and that what we call constraining is a better candidate for being considered prob­ abilistic expansion.

Probabilistic Belief Change: Expansion, Conditioning and Constraining