Euclidis Posteriores Libri IX, also known as Euclid's Elements, is a mathematical treatise written by the ancient Greek mathematician Euclid. The book contains a collection of mathematical proofs and propositions, covering a wide range of topics including geometry, number theory, and algebra. The work is divided into nine books, each of which focuses on a different area of mathematics. The first six books deal with plane geometry, while the remaining three books cover solid geometry, number theory, and the theory of ratios and proportions. The book is considered one of the most influential works in the history of mathematics, and has been used as a textbook for centuries. This particular edition, published in 1607, includes Latin translations of the original Greek text, as well as commentary and annotations by the editor.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.