### Andrés Eduardo Caicedo

Shared publicly -Mathematical Reviews and zbMATH ask for your feedback to revise the MSC classification scheme. More info at http://msc2020.org.

Mathematical Reviews (MR) and zbMATH cooperate in maintaining the Mathematics Subject Classification (MSC), which is used by these reviewing services, publishers, and others to categorize items in the mathematical sciences literature. The current version, MSC2010, consists of 63 areas classified ...

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See the discussion at http://mathoverflow.net/q/28334/1946. Some mathematicians there support the idea of using a tag-based system, something like MO, rather than a hierarchical tree structure for the Math Review subject codes. I am convinced they are right. It seems to me there is little need in the Math Reviews to insist on the organization of area/topic/sub-topic, and a less hierarchical system of tags would be both more useful and more robust in the long term.

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