AMS peer-reviewed journals are of the highest quality in mathematical research. Our journals have been published since 1891 and cover a broad range of mathematics. Each journal is managed by editors who are prominent in their fields, and each is unique in its offering of articles, book reviews, and reports. In addition to publishing and distributing printed journals, the AMS offers searchable electronic versions that are available prior to the print versions. When the journal is available in electronic format, the electronic version is considered the version of record.