Mathematical Treasures - Gemma Frisius's Arithmeticae Methodus Facilis

Frank J. Swetz and Victor J. Katz

Title page

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.

Sig. D. f.1 r

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

D f.4 v

Here, Gemma describes a method of finding square roots.

Index to Mathematical Treasures