Comments on Comparing Context Updates Delineation and Scale Based Models of Vagueness

In ‘Comparing Context Updates in Delineation and Scale Based Models of Vagueness’, Christoph Roschger argues that two frameworks, due respectively to Kyburg & Morreau and Barker, bear important similarities to each other in certain respects. Roschger begins by summarizing the respective frameworks, which I will not repeat, and proceeds to define four mappings: for each framework, he provides a mapping both to and from subsets of the space of classical possible worlds. By composing these mappings, Roschger uses these subsets as intermediaries, to move from one framework to the other and back again. This note will be spent reviewing these mappings. My goal is to clarify how they do their respective jobs, and to correct some errors in Roschger’s work.