2019 Reprint of 1926 Second Edition. Volume One; Introduction by Heath and Books I & II. Full facsimile of the original edition, not reproduced with Optical Recognition software. This unabridged republication of the enlarged Second Edition contains the complete English text of Volume One of this series, which includes the Introduction by Heath and Books I & II of the Elements. The Elements is still considered a masterpiece in the application of logic to mathematics. In historical context, it has proven enormously influential in many areas of science. Scientists the likes of Nicolaus Copernicus, Johannes Kepler, Galileo Galilei, and Sir Isaac Newton were all influenced by the Elements, and applied their knowledge of it to their work. Mathematicians and philosophers, such as Thomas Hobbes, Baruch Spinoza, Alfred North Whitehead, and Bertrand Russell, have attempted to create their own foundational "Elements" for their respective disciplines, by adopting the axiomatized deductive structures that Euclid's work introduced. The success of the Elements is due primarily to its logical presentation of most of the mathematical knowledge available to Euclid. Contents: 151-page Introduction by Heath. Books I and II of the Elements, straight lines, angles, intersection of lines, triangles, parallelograms, etc.