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Michael A. B. Deakin

mathematician, astronomer, and geographer, was the principal figure of the “silver age” of ancient Greek mathematics. Little is known of his life; what the sources tell us is contradictory and unreliable. The little we do know reliably is gleaned rather from what survives of his writing. His principal work, at least in what has survived, is the Synagoge or Collection, and even this has not reached us in its entirety. It is described as having comprised eight books, of which the first and part of the second are missing. The only other work of his that survives in the original Greek (and that only in part) is a commentary on Ptolemy’s Almagest. Beyond these are works in other languages that are thought to be translations of originals by him. An Arabic commentary on Book X of Euclid’s Elements may be a translation of a work he is ...