and propositions contained in the first 13 books, but without the clarity and rigor of the preceding volumes. Obviously a work in progress, these pages document Euclid’s efforts to settle ...

Euclid's order unnaturally separates propositions which should come together, e.g. I. 4, 8, 26, and is, therefore, a serious hindrance to a clear grasp of the subject-matter as distinct from mere ...