Gerland (mathematician)

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Gerland was an 11th‑century mathematician who worked in England after the Norman Conquest. Not much is known about his life. He wrote a treatise on the Computus (the calendar calculations used to determine Easter), and he also produced work on the abacus. The Computus book is in the British Museum, and his abacus-related writings are preserved in the Bibliothèque nationale de France in Paris.