Terminology: Opposite of "refinement"

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Let A be a partition of a set, and B a refinement of A. Fill in the blanks: A is a __________ of B. I know that A is coarser than B, but how does one turn that into a noun?

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1 Answer

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The term I would use is "coarsening," as mentioned in the comments. This shows up, for example, in discussions of common knowledge and Aumann's agreement theorem.

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