## Transformation Geometry: An Introduction to SymmetryTransformation geometry is a relatively recent expression of the successful venture of bringing together geometry and algebra. The name describes an approach as much as the content. Our subject is Euclidean geometry. Essential to the study of the plane or any mathematical system is an under standing of the transformations on that system that preserve designated features of the system. Our study of the automorphisms of the plane and of space is based on only the most elementary high-school geometry. In particular, group theory is not a prerequisite here. On the contrary, this modern approach to Euclidean geometry gives the concrete examples that are necessary to appreciate an introduction to group theory. Therefore, a course based on this text is an excellent prerequisite to the standard course in abstract algebra taken by every undergraduate mathematics major. An advantage of having nb college mathematics prerequisite to our study is that the text is then useful for graduate mathematics courses designed for secondary teachers. Many of the students in these classes either have never taken linear algebra or else have taken it too long ago to recall even the basic ideas. It turns out that very little is lost here by not assuming linear algebra. A preliminary version of the text was written for and used in two courses-one was a graduate course for teachers and the other a sophomore course designed for the prospective teacher and the general mathematics major taking one course in geometry. |

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2-center AABC affine transformation Algebra Archimedean solid axes Cartesian plane Cayley table center of symmetry Ceva's Theorem collinear collineation concurrent congruent contains cube cyclic group dilation directed angle elements equilateral Euler Figure finite group fixed point fixes line following theorem form a group frieze group frieze pattern geometry glide reflection group of isometries halfturn Hence hexagon identity images integer inverse involution involutory isometry that fixes line of symmetry mathematics midpoint monohedral tiling n-gon ninepoint circle nonidentity rotation nonidentity translation odd isometries parallel lines parallelogram perpendicular bisector Platonic solids point of symmetry point Q polyhedron prototile Prove or disprove ratio reflection with axis rotary reflection rotation group set of points sides similarity ſº square stretch Suppose symmetry group ta.c tessellation three noncollinear points three reflections tiles the plane triangle unique unit cell vertex vertices wallpaper group wallpaper pattern