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This is the title page of the Arithmeticae Practicae Methodus Facilis (1540), by Gemma Frisius (originally Regnier Gemma) (1508-1555). Gemma Frisius was best known for his work in astronomy and map-making; he worked closely with Gerardus Mercator in making an early globe. He also suggested a method for determining longitude at sea.

On this page is an example of the use of double false position to solve a problem in two unknowns.

Here, Gemma describes a method of finding square roots.
Frank J. Swetz and Victor J. Katz, "Mathematical Treasures - Gemma Frisius's Arithmeticae Methodus Facilis," Loci (January 2011)
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