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zbMATH Open (formerly known as Zentralblatt MATH) is the world's most comprehensive and longest-running abstracting and reviewing service in pure and applied mathematics. It is edited by the European Mathematical Society (EMS), the Heidelberg Academy of Sciences and Humanities, and FIZ Karlsruhe. The editorial work is done by the Berlin office of FIZ Karlsruhe, which as a member of the Leibniz Association is a non-profit company and a recognized organisation serving the public interest. Since January 2021, zbMATH Open has been available as an open access database.