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         Euclidean Geometry:     more books (100)
  1. Foundations of Plane Geometry by Harvey I. Blau, 2002-11-11
  2. Foundations of Projective Geometry by Robin Hartshorne, 2009-12-23
  3. Modern Geometries: Non-Euclidean, Projective, and Discrete Geometry (2nd Edition) by Michael Henle, 2001-01-22
  4. Elementary Geometry by R. David Gustafson, Peter D. Frisk, 1991-01
  5. Geometry Civilized: History, Culture, and Technique by J. L. Heilbron, 2000-03-16
  6. Comparison Theorems in Riemannian Geometry (AMS Chelsea Publishing) by Jeff Cheeger and David G. Ebin, 2008-08-04
  7. The Non-Euclidean Revolution (Modern Birkhäuser Classics) by Richard J. Trudeau, 2008-01-21
  8. Episodes in Nineteenth and Twentieth Century Euclidean Geometry (New Mathematical Library) by Ross Honsberger, 1996-09-05
  9. Lectures on Hyperbolic Geometry (Universitext) (Volume 0) by Riccardo Benedetti, Carlo Petronio, 1992-09-03
  10. Quasicrystals and Geometry by Marjorie Senechal, 1996-09-28
  11. Geometry by Michele Audin, 2002-11-11
  12. Journey into Geometries (Spectrum) by Marta Sved, 1997-07
  13. The Fourth Dimension and Non-Euclidean Geometry in Modern Art by Linda Dalrymple Henderson, 1983-09
  14. Riemannian Geometry by Luther Pfahler Eisenhart, 1997-10-13

41. 51M04: Elementary Euclidean Geometry (2-dimensional)
links Selected topics here 51M04 Elementary euclidean geometry(2dimensional). Introduction. Ordinary plane geometry (such
http://www.math.niu.edu/~rusin/known-math/index/51M04.html
Search Subject Index MathMap Tour ... Help! ABOUT: Introduction History Related areas Subfields
POINTERS: Texts Software Web links Selected topics here
51M04: Elementary Euclidean geometry (2-dimensional)
Introduction
Ordinary plane geometry (such as is studied in US secondary schools) holds an irresistible appeal, although many results derive what appear to be unimaginative conclusions from tortured premises. Nonetheless, from time to time something catches our eye and gets us to think about ordinary triangles and circles.
History
Applications and related fields
Constructibility with compass and straightedge is dealt with elsewhere Tilings and packings in the plane are part of Convex Geometry Many topics regarding polygons (e.g. decompositions into triangles and so on) are treated as part of polyhedral geometry
Subfields
Parent field: 51M - Real and Complex Geometry
Textbooks, reference works, and tutorials
Software and tables
A compendium of plane curves For computational geometry see 68U05: Computer Graphics
Other web sites with this focus
  • The Geometry Junkyard has a "pile" for planar geometry (and other related topics of interest!)

42. 51M05: General Euclidean Geometry
Introduction. We use this category to hold files concerning nonplanareuclidean geometry topics. The files on this page are more
http://www.math.niu.edu/~rusin/known-math/index/51M05.html
Search Subject Index MathMap Tour ... Help! ABOUT: Introduction History Related areas Subfields
POINTERS: Texts Software Web links Selected topics here
51M05: General Euclidean geometry
Introduction
We use this category to hold files concerning non-planar Euclidean geometry topics. The files on this page are more like samples of the techniques one may use for 3D problems (or n-dimensional: much of what is here is really independent of the number of dimensions.)
History
Applications and related fields
The actions of the point groups among the crystallographic groups are the basis for the construction of the Platonic solids and the regular divisions of the sphere in R^3. For more information, consult the polyhedra and spheres pages.
Subfields
Parent field: 51M - Real and Complex Geometry
Textbooks, reference works, and tutorials
Software and tables
For computational geometry see 68U05: Computer Graphics Pointer to Mesa , a 3-D graphics library (similar to OpenGL).
Other web sites with this focus
Selected topics at this site

43. Non-Euclidean (hyperbolic) Geometry Applet
Noneuclidean geometry. But, in fact, in terms of the non-euclidean geometry,despite appearances, these motions preserve distances and angles.
http://www.math.umn.edu/~garrett/a02/H2.html
Non-Euclidean Geometry
This applet allows click-and-drag drawing in the Poincare model of the (hyperbolic) non-Euclidean plane, and also motion . The circular arcs drawn by mouse drags are the geodesics (straight lines) in this model of geometry. In "move" mode, click-and-drag slides the whole picture in the direction of the mouse drag. This is analogous to ordinary "sliding" of objects in Euclidean space; however, in this non-Euclidean geometry the Euclidean picture of it makes things appear to become smaller as they move toward the edge. But, in fact, in terms of the non-Euclidean geometry, despite appearances, these motions preserve distances and angles. The preservation of angles should be detectable if one keeps in mind that the angles are angles between the arcs of circles at their point of intersection. Since the bounding circle is "infinitely far away", the motion of the picture does not exactly parallel the mouse drag motion, but instead moves about the same non-Euclidean distance as the Euclidean distance moved by the mouse. So the picture will appear to lag behind the mouse. The University of Minnesota explicitly requires that I state that "The views and opinions expressed in this page are strictly those of the page author. The contents of this page have not been reviewed or approved by the University of Minnesota."

44. MATH 6118: Non-euclidean Geometry
MATH 6118 090 Non-euclidean geometry SPRING 2002. Chapter 2 EuclideanGeometry from January 9, 16, and 23, available as one PDF file.
http://www.math.uncc.edu/~droyster/courses/spring02/
MATH 6118 - 090
Non-Euclidean Geometry
SPRING 2002 Dr. David C. Royster
droyster@email.uncc.edu
General Class Information
Class Syllabus . Click here for a PDF version for printing. List of topics to be covered each day.Click here for a PDF version for printing.
Class Worksheets and Lecture Notes
Chapter 1: History from January 9, 2002, available as a PDF file. Chapter 2: Euclidean Geometry from January 9, 16, and 23, available as one PDF file. This is the amended file that contains the graphics. Chapter 3: Euclidean Constructions from January 30, available as one PDF file. Lab Day: Introduction to Geometer's Sketchpad from February 6, available as a PDF file. Chapter 4: Introduction to Hyperbolic Geometry from February 13, available as one PDF file. Chapter 5: Poincare Models of Hyperbolic Geometry from February 27, available as one PDF file. Chapter 6: Hyperbolic Analytic Geometry from March 27, available as one PDF file.
Assignments
Assignment 2 Homework 2 Solutions: PDF file Assignment 3 Homework 3 Solutions: PDF file Geometer's Sketchpad Activities Assignment 4 Solutions using JavaSketchPad Assignment 6 (What happened to Assignment 5?)

45. Non-Euclidean Geometry Seminar
Seminar notes by Greg Schreiber.Category Science Math Geometry NonEuclidean...... We began with an exposition of euclidean geometry, first from Euclid's perspective(as given in his Elements) and then from a modern perspective due to Hilbert
http://www.math.columbia.edu/~pinkham/teaching/seminars/NonEuclidean.html
Seminar on the History of Hyperbolic Geometry
Greg Schreiber
In this course we traced the development of hyperbolic (non-Euclidean) geometry from ancient Greece up to the turn of the century. This was accomplished by focusing chronologically on those mathematicians who made the most significant contributions to the subject. We began with an exposition of Euclidean geometry, first from Euclid's perspective (as given in his Elements) and then from a modern perspective due to Hilbert (in his Foundations of Geometry). Almost all criticisms of Euclid up to the 19th century were centered on his fifth postulate, the so-called Parallel Postulate.The first half of the course dealt with various attempts by ancient, medieval, and (relatively) modern mathematicians to prove this postulate from Euclid's others. Some of the most noteworthy efforts were by the Roman mathematician Proclus, the Islamic mathematicians Omar Khayyam and Nasir al-Din al-Tusi, the Jesuit priest Girolamo Sacchieri, the Englishman John Wallis, and the Frenchmen Lambert and Legendre. Each one gave a flawed proof of the parallel postulate, containing some hidden assumption equivalent to that postulate. In this way properties of hyperbolic geometry were discovered, even though no one believed such a geometry to be possible. References: Four general references were used throughout this course: Bonola's Non-Euclidean Geometry, Jeremy Gray's Ideas of Space, Greenberg's Euclidean and Non-Euclidean Geometries, and McCleary's Geometry from a Differential Viewpoint. In addition, original works of these mathematicians were used whenever possible, as well as biographies of them. These books included Euclid's Elements, Hilbert's Foundations of Geometry, Proclus's A Commentary on the First Book of Euclid's Elements, Saccheri's Euclid Vindicated, Bolyai's Science of Absolute Space, Lobachevskii's Geometrical Researches in the Theory of Parallels, and Riemann's "On the Hypotheses Which Lie at the Foundations of Geometry," among others.

46. Euclidean & Non Euclidean Geometry
EUCLIDEAN NONeuclidean geometry. Before I address the topic of Euclideangeometry, I'd like to try to clarify exactly what euclidean geometry is.
http://www.dsdk12.net/project/euclid/GEOEUC~1.HTM
Most of us are familiar with the term geometry. The only real difference between one high-schooler and another's opinion on geometry is the connotation of the word. It may be interesting to know for someone whose knowledge on geometery comes only fro m the course they took in high school that what they learned to be a straight line is curved in other types of geometry. These types of geometry are called non-Euclidean because they do not follow the rules that were concretely established in Euclid's El ements. Before I address the topic of Euclidean geometry, I'd like to try to clarify exactly what Euclidean geometry is. Euclidean geometry consists of all the known rules, definitions, propositions, and thereoms before and up to the time of the Greek scholar Euclid. Euclid compiled all of this information into a thirteen-volume set of books entitled Euclid's Elements. The books start with those studies of Pythagoras. Of course, Pythagoras' most known contribution to geometry is the Pythagoram Thereom - a2 + b2 = c2. Other mathematicians whose studies are found in the Elements are Apollonius, who contributed to conics, and Archimedes, who gave his knowledge of mechanics and the areas of circles. I think the best way to describe Euclidean geometry is to say that it is all based on the daily human perception of the world, and with the relationship between objects. For example, if I am standing on a floor in school, it is a given that the floor is level. If I am looking at a desktop parallel to the floor then one can only draw the assumption that the desktop is also level. I drew all of these assumptions based on the location and relativity of the objects near me. If I take a ruler and lay it on its side on a desktop, and they align, the desktop is straight. Straight is known also as a 180 degree angle.

47. NRICH | Secondary Topics | Measures | Euclidean Geometry
GeometryCoordinate + Geometry-Euclidean + Graph Theory + Groups + Investigation+ Logic - Measures + Area - euclidean geometry + Pythagoras Theorem
http://www.nrich.maths.org.uk/topic_tree/Measures/Euclidean_Geometry/
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48. NRICH | Secondary Topics | Euclidean Geometry
Top Level + 3D + Algebra + Analysis + Calculus + Combinatorics + Complex Numbers euclidean geometry + 3D + Properties of Shapes + Geometry + Geometry
http://www.nrich.maths.org.uk/topic_tree/Euclidean_Geometry/
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Articles Inspirations ... Interactivities Web board Ask NRICH Asked NRICH NRICH Club Register Tough Nuts About Help! ... Where is NRICH? Associated Projects Maths Thesaurus MOTIVATE EuroMaths Millennium Maths ... Other Maths sites Display maths using fonts images Help Back Issues Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Bernard's Bag(P) - solutions(P) Penta Probs(P) - solutions(P) Let Me Try(P) - solutions(P) Kid's Mag(P) Play Games(P) Staff Room(P) 6 Problems - solutions 15+Challenges - solutions Articles Games LOGOland Editorial News Click on the folders to browse problem topics from the secondary site. You can then go directly to each of the problems. Top Level Algebra Analysis Calculus Combinatorics Complex Numbers Euclidean Geometry Properties of Shapes Geometry Geometry Euclidean Geometry-Coordinate Geometry-Euclidean Groups Investigation Investigations Logic Measures Mechanics Number Pre-calculus Probability Programs Properties of Shapes Statistics Trigonometry Unclassified algebra geometry-coordinate number

49. Applications Of Non-Euclidean Geometry
The Applications Of Noneuclidean geometry. Table of Contents. 1.Where EuclideanGeometry Is Wrong. 5.Celestial Mechanics. Where euclidean geometry Is Wrong.
http://members.tripod.com/~noneuclidean/applications.html
The Applications Of Non-Euclidean Geometry
Table of Contents Where Euclidean Geometry Is Wrong The Theory of General Relativity Spherical Geometry Celestial Mechanics
Where Euclidean Geometry Is Wrong
Since Euclid first published his book Elements in 300 B.C. it has remained remarkably correct and accurate to real world situations faced on Earth. The one problem that some find with it is that it is not accurate enough to represent the three dimensional universe that we live in. It has been argued that Euclidean Geometry, while good for architecture and to survey land, when it is moved into the third dimension, the postulates do not hold up as well as those of hyperbolical and spherical geometry. Both of those geometries hold up to a two dimensional world, as well as the third dimension.
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Cosmology - Cosmology is the study of the origin, constitution, structure, and evolution of the universe.
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The Theory of General Relativity
Einstein's Theory Of General Relativity is based on a theory that space is curved. The cause is explained by the theory itself. Einstein's General Theory of Relativity can be understood as saying that:
  • Matter and energy distort space
  • The distortions of space affect the motions of matter and energy.
  • 50. What Is Non-Euclidean Geometry?
    What is Noneuclidean geometry? Non l. Other than this difference, non-Euclideangeometry holds to the rest of Euclid's postulates
    http://members.tripod.com/~noneuclidean/whatisit_main.html
    What is Non-Euclidean Geometry?
    Non Euclidean geometry is geometry that refutes Euclid's fifth postulate: Given a point p and a line l, there is exactly one line through p that is parralel to l. Other than this difference, non-Euclidean geometry holds to the rest of Euclid's postulates:
    • Two points determine a line
    • A straight line can be extended with no limitation
    • Given a point and a distance a circle can be drawn with the point as center and the distance as radius
    • All right angles are equal
    To see how this movement got started, please see the History section. Now, there are two ways that you can refute this. One way is to say: Given a line l and point p, there are no lines parralel to l through p. This leads to Spherical/Elliptical Geometry The other is to say: Given a line l and a point p, there are infinite lines through p parralel to l. This leads to Hyperbolic Geometry This page has been visited
    Bibliography
    Here are some pages I found most useful in creating this webpage:

    51. Non-Euclidean Geometry
    Noneuclidean geometry. Despite element. This course intends to be a businesslikeintroduction to non-euclidean geometry for nonexperts.
    http://www.mccme.ru/mathinmoscow/courses/noneucld.htm
    Non-Euclidean Geometry
    Despite the fact that non-Euclidean geometry has found its use in numerous applications (the most striking example being 3-dimensional topology), it has retained a kind of exotic and romantic element. This course intends to be a businesslike introduction to non-Euclidean geometry for nonexperts. Prerequisites from linear algebra, point set topology, group theory, metric spaces. Axioms for plane geometry. The inversive models. The hyperboloid and the Klein model. The geometry of the sphere. Some computations in the hyperbolic plane and on the sphere. Hyperbolic isometries. Convex polygons. Isoperimetric inequality in non-Euclidean geometry. Hyperbolic surfaces. Books: I. S. Iversen, Hyperbolic geometry , Cambridge Univ. Press 1993
    H. S. Coxeter, Non-Euclidean Geometry , Toronto Univ. Press, 1957 Math in Moscow Home Page List of courses

    52. Euclidean Geometry
    euclidean geometry. From Sir Thomas L. Heath's translation of Euclid'sElements Postulates. Let the following be postulated 1. To
    http://www.mtholyoke.edu/courses/jmorrow/euclid.html
    HOME COURSE INFORMATION Euclidean Geometry From Sir Thomas L. Heath's translation of Euclid's Elements
    Postulates Let the following be postulated:
    1. To draw a straight line from any point to any point.
    2. To produce a finite straight line continuously in a straight line.
    3. To describe a circle with any centre and distance.
    4. That all right angles are equal to one another.
    5. That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
    Some definitions from the same source:
    1. A point is that which has no part.
    2. A line is breadthless length.
    3. The extremities of a line are points 4. A straight line is a line which lies evenly with the the points on itself. 5. A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line. 6. When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right Common Notions 1. Things which are equal to the same thing are also equal to one another.

    53. Key College Publishing: Posamentier/Advanced Euclidean Geometry
    Advanced euclidean geometry Excursions for Students and Teachers WithIllustrations in The Geometer’s Sketchpad ®. Alfred S. Posamentier
    http://www.keycollege.com/catalog/titles/advanced_euclidean_geom.html
    Home Customer Service Ordering Information Contact Us ... Site Map Product Information Mathematics Products Statistics Products Software Products Partners in Publishing ... Author Web Sites
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    Advanced Euclidean Geometry: Excursions for Students and Teachers
    With Illustrations in
    Alfred S. Posamentier, City College, The City University of New York
    Advanced Euclidean Geometry fills this void by providing a thorough review of the essentials of the high school geometry course and then expanding those concepts to advanced Euclidean geometry, to give teachers more confidence in guiding student explorations and questions. The text contains hundreds of illustrations created in Sketchpad This title is available through your college bookstore and is also available packaged with a specially priced Student Bundle Package of version 4. Contact your Key College Publishing sales representative.

    54. Key College Publishing: Advanced Euclidean Geometry
    Print This Page, Advanced euclidean geometry Excursions for Studentsand Teachers With Illustrations in The Geometer’s Sketchpad ®.
    http://www.keycollege.com/catalog/printer_friendly/advanced_euclidean_geom.html
    Print This Page
    Advanced Euclidean Geometry: Excursions for Students and Teachers
    With Illustrations in
    Alfred S. Posamentier, City College, The City University of New York
    Advanced Euclidean Geometry fills this void by providing a thorough review of the essentials of the high school geometry course and then expanding those concepts to advanced Euclidean geometry, to give teachers more confidence in guiding student explorations and questions. The text contains hundreds of illustrations created in Sketchpad This title is available through your college bookstore and is also available packaged with a specially priced Student Bundle Package of version 4. Contact your Key College Publishing sales representative. Instructor Resources will be available to qualified adopters and will also be available online. Publication will follow publication of the text. Advanced Euclidean Geometry
    and Dynamic Geometry are registered trademark of Key Curriculum Press. Sketchpad is a trademark of Key Curriculum Press.

    55. Non-Euclidean Geometry
    Noneuclidean geometry. Introduction Unlike other alone. However, Euclideangeometry was defined as using all five of the axioms. The
    http://www.geocities.com/CapeCanaveral/7997/noneuclid.html
    Non-Euclidean Geometry
    Introduction: Unlike other branches of math, geometry has been connected with two purposes since the ancient Greeks. Not only is it an intellectual discipline, but also, it has been considered an accurate description of our physical space. However in order to talk about the different types of geometries, we must not confuse the term geometry with how physical space really works. Geometry was devised for practical purposes such as constructions, and land surveying. Ancient Greeks, such as Pythagoras (around 500 BC) used geometry, but the various geometric rules that were being passed down and inherited were not well connected. So around 300 BC, Euclid was studying geometry in Alexandria and wrote a thirteen-volume book that compiled all the known and accepted rules of geometry called The Elements, and later referred to as Euclid’s Elements. Because math was a science where every theorem is based on accepted assumptions, Euclid first had to establish some axioms with which to use as the basis of other theorems. He used five axioms as the 5 assumptions, which he needed to prove all other geometric ideas. The use and assumption of these five axioms is what it means for something to be categorized as Euclidean geometry, which is obviously named after Euclid, who literally wrote the book on geometry. The first four of his axioms are fairly straightforward and easy to accept, and no mathematician has ever seriously doubted them. The first four of Euclid’s axioms are:

    56. Geomview Manual - Non-Euclidean Geometry
    Noneuclidean geometry. Geomview supports hyperbolic and sphericalgeometry as well as euclidean geometry. The three buttons at the
    http://www.geomview.org/docs/html/geomview_70.html
    Go to the first previous next last section, table of contents
    Non-Euclidean Geometry
    Geomview supports hyperbolic and spherical geometry as well as Euclidean geometry. The three buttons at the bottom of the Main panel are for setting the current geometry type. In each of the three geometries, three models are supported: Virtual Projective , and Conformal . You can change the current model with the Model browser on the Camera panel. Each Geomview camera has its own model setting. The default model is all three spaces is Virtual . This corresponds to the camera being in the same space as, and moving under the same set of transformations as, the geometry itself. In Euclidean space Virtual is the most useful model. The other models were implemented for hyperbolic and spherical spaces and just happen to work in Eucldiean space as well: Projective is the same as Virtual but by default displays the unit sphere, and Conformal displays everything inverted in the unit sphere. In hyperbolic space, the Projective model setting gives a view of the projective ball model of hyperbolic 3-space imbedded in Euclidean space. The camera is initially outside the unit ball. In this model, the camera moves by Euclidean motions and geometry moves by hyperbolic motions. Conformal model is similar but shows the conformal ball model instead.

    57. Geomview Manual - Non-Euclidean Geometry
    Go to the previous, next section. Noneuclidean geometry. Geomview supportshyperbolic and spherical geometry as well as euclidean geometry.
    http://www.geom.uiuc.edu/software/geomview/docs/geomview_10.html
    Go to the previous next section.
    Non-Euclidean Geometry
    Geomview supports hyperbolic and spherical geometry as well as Euclidean geometry. The three buttons at the bottom of the Main panel are for setting the current geometry type. In each of the three geometries, three models are supported: Virtual Projective , and Conformal . You can change the current model with the Model browser on the Camera panel. Each Geomview camera has its own model setting. The default model is all three spaces is Virtual . This corresponds to the camera being in the same space as, and moving under the same set of transformations as, the geometry itself. In Euclidean space Virtual is the most useful model. The other models were implemented for hyperbolic and spherical spaces and just happen to work in Eucldiean space as well: Projective is the same as Virtual but by default displays the unit sphere, and Conformal displays everything inverted in the unit sphere. In hyperbolic space, the Projective model setting gives a view of the projective ball model of hyperbolic 3-space imbedded in Euclidean space. The camera is initially outside the unit ball. In this model, the camera moves by Euclidean motions and geometry moves by hyperbolic motions. Conformal model is similar but shows the conformal ball model instead.

    58. Euclidean Geometry Resources
    euclidean geometry resources. Recommended References. see index fortotal category for your convenience Best Retirement Spots
    http://futuresedge.org/mathematics/Euclidean_Geometry_.html
    Euclidean Geometry resources.
    Recommended References. [see index for total category]
    for your convenience: Best Retirement Spots Web Hosting ULTRAToolBox Resources on Diet and Nutrition Pain Relief Allergies Tech Refresh , and finally - a must check - Mediterranean diet Discovery. Euclidean Geometry applications, theory, research, exams, history, handbooks and much more
    Introduction:

    Introduction to Hyperbolic Geometry (Universitext)
    by Arlan Ramsay
    Introduction to Non-Euclidean Geometry
    by Harold E. Wolfe
    Compact Riemann Surfaces: An Introduction to Contemporary Mathematics (Universitext)
    by Jurgen Jost
    Introduction to Non-Euclidean Geometry
    by Harold Eichholtz Wolfe
    Introduction to Non-Euclidean Geometry
    by David. Gans
    Applications:
    Theory:
    Hardy Spaces on the Euclidean Space (Sprringer Monographs in Mathematics) by Akihito Uchiyama Probability Theory of Classical Euclidean Optimization Problems (Lecture Notes in Mathematics (Springer-Verlag), 1675) by Joseph Yukich Shadows of the Circle: Conic Sections, Optimal Figures and Non-Euclidean Geometry by Vagn Lundsgaard Hansen Spectral Asymptotics on Degenerating Hyperbolic 3-Manifolds (Memoirs of the American Mathematical Society, 643)

    59. Non-Euclidean Geometry Resources
    Noneuclidean geometry resources. Recommended References. see indexfor total category for your convenience Best Retirement Spots
    http://futuresedge.org/mathematics/Non-Euclidean_Geometry.html
    Non-Euclidean Geometry resources.
    Recommended References. [see index for total category]
    for your convenience: Best Retirement Spots Web Hosting ULTRAToolBox Resources on Diet and Nutrition Pain Relief Allergies Tech Refresh , and finally - a must check - Mediterranean diet Discovery. Non-Euclidean Geometry applications, theory, research, exams, history, handbooks and much more
    Introduction:

    Introduction to Hyperbolic Geometry (Universitext)
    by Arlan Ramsay
    Applications:
    Theory:

    The Nature and Power of Mathematics
    by Donald M. Davis
    Shadows of the Circle: Conic Sections, Optimal Figures and Non-Euclidean Geometry
    by Vagn Lundsgaard Hansen
    Spectral Asymptotics on Degenerating Hyperbolic 3-Manifolds (Memoirs of the American Mathematical Society, 643)
    by Jozef Dodziuk
    Hyperbolic Manifolds and Discrete Groups
    by Michael Kapovich Compact Riemann Surfaces: An Introduction to Contemporary Mathematics (Universitext) by Jurgen Jost Non-Euclidean Geometry in the Theory of Automorphic Functions (History of Mathematics, V. 17) by Jacques Hadamard Geometric Asymptotics for Nonlinear PDE. I

    60. Non-Euclidean Geometry
    encyclopediaEncyclopedia noneuclidean geometry. non-euclidean geometry,branch of geometry in which the fifth postulate of Euclidean
    http://www.infoplease.com/ce6/sci/A0835830.html

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    Newsletter You've got info! Help Site Map Visit related sites from: Family Education Network Encyclopedia non-Euclidean geometry non-Euclidean geometry, branch of geometry in which the fifth postulate of Euclidean geometry, which allows one and only one line parallel to a given line through a given external point, is replaced by one of two alternative postulates. Allowing two parallels through any external point, the first alternative to Euclid 's fifth postulate, leads to the hyperbolic geometry developed by the Russian N. I. Lobachevsky in 1826 and independently by the Hungarian Janos Bolyai in 1832. The second alternative, which allows no parallels through any external point, leads to the elliptic geometry developed by the German Bernhard Riemann in 1854. The results of these two types of non-Euclidean geometry are identical with those of Euclidean geometry in every respect except those propositions involving parallel lines, either explicitly or implicitly (as in the theorem for the sum of the angles of a triangle).

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