Nicholas Mercator was a German mathematician and music theorist. He is known largely for his far-reaching mathematical achievements outside the world of musical tuning, but he played a very large role in the ‘prehistory’ of regular temperament theory, laying many of its foundational concepts.

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He was one of the first people in the world to discuss the concepts of 53edo and 55edo. He discovered Mercator’s old comma, related to 55edo, as well as the modern [Mercator's comma]], a comma which later resulted in the important Mercator family of temperaments. He also played a major role in the discovery of the Holdrian comma.

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