The Foundations of Geometry, by David Hilbert, is part of the HackerNoon Books Series. Read this book online for free on HackerNoon! Title: The Foundations of Geometry Author: David Hilbert Release Date: December 23, 2005 [eBook #17384] [Most recently updated: June 13, 2022] Language: English Table of Links Introduction Chapter I - THE FIVE GROUPS OF AXIOMS. The elements of geometry and the five groups of axioms Group I: Axioms of connection Group II: Axioms of Order Consequences of the axioms of connection and order Group III: Axiom of Parallels (Euclid’s axiom) Group IV: Axioms of congruence Consequences of the axioms of congruence Group V: Axiom of Continuity (Archimedes’s axiom) CHAPTER II - THE COMPATIBILITY AND MUTUAL INDEPENDENCE OF THE AXIOMS. Compatibility of the axioms Independence of the axioms of parallels. Non-euclidean geometry Independence of the axioms of congruence Independence of the axiom of continuity. Non-archimedean geometry CHAPTER III - THE THEORY OF PROPORTION. Complex number-systems Demonstration of Pascal’s theorem An algebra of segments, based upon Pascal’s theorem Proportion and the theorems of similitude Equations of straight lines and of planes CHAPTER IV - THE THEORY OF PLANE AREAS. Equal area and equal content of polygons Parallelograms and triangles having equal bases and equal altitudes The measure of area of triangles and polygons Equality of content and the measure of area CHAPTER V - DESARGUES’S THEOREM. Desargues’s theorem and its demonstration for plane geometry by aid of the axioms of congruence The impossibility of demonstrating Desargues’s theorem for the plane without the help of the axioms of congruence Introduction of an algebra of segments based upon Desargues’s theorem and independent of the axioms of congruence The commutative and the associative law of addition for our new algebra of segments The associative law of multiplication and the two distributive for the new algebra of segments Equation of the straight line, based upon the new algebra of segments The totality of segments, regarded as a complex number system Construction of a geometry of space by aid of a desarguesian number system Significance of Desargues’s theorem CHAPTER VI - PASCAL’S THEOREM. Two theorems concerning the possibility of proving Pascal’s theorem The commutative law of multiplication for an archimedean number system The commutative law of multiplication for a non-archimedean number system Proof of the two propositions concerning Pascal’s theorem. Non-pascalian geometry. The demonstration, by means of the theorems of Pascal and Desargues, of any theorem relating to points of intersection CHAPTER VII - GEOMETRICAL CONSTRUCTIONS BASED UPON THE AXIOMS I–V. Geometrical constructions by means of a straight-edge and a transferer of segments Analytical representation of the co-ordinates of points which can be so constructed The representation of algebraic numbers and of integral rational functions as sums of squares Criterion for the possibility of a geometrical construction by means of a straight-edge and a transferer of segments About HackerNoon Book Series: We bring you the most important technical, scientific, and insightful public domain books. This book is part of the public domain. David Hilbert (2005). The Foundations of Geometry. Urbana, Illinois: Project Gutenberg. Retrieved May 2022, from https://www.gutenberg.org/files/17384/17384-pdf.pdf This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever.  You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org , located at https://www.gutenberg.org/policy/license.html .

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