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MSC2020 is the latest revision of the Mathematics Subject Classification (MSC), jointly published by Mathematical Reviews and zbMATH Open under a Creative Commons CC-BY-NC-SA license. It replaces the 2010 Mathematics Subject Classification. For details on the revision, read more in the article https://doi.org/10.4171/NEWS/115/2.
The final version is also available as a complete msc2020.pdf file.