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en.wikipedia.org/wiki/Affine_geometry

In mathematics, affine geometry is what remains of Euclidean geometry when not using the metric notions of distance and angle. As the notion of parallel lines is ...

mathworld.wolfram.com/AffineGeometry.html

An affine geometry is a geometry in which properties are preserved by parallel projection from one plane to another. In an affine geometry, the third and fourth of  ...

www.cis.upenn.edu/~cis610/geombchap2.pdf

planes in terms of affine forms is reviewed. The section ends with a closer look at the intersection of affine subspaces. Our presentation of affine geometry is far ...

www.cut-the-knot.org/triangle/pythpar/Geometries.shtml

It's a known dictum that in Affine Geometry all triangles are the same. In this context, the word affine was first used by Euler (affinis). In modern parlance, Affine ...

www-history.mcs.st-and.ac.uk/~john/geometry/Lectures/L13.html

Affine Geometry. Recall from an earlier section that a Geometry consists of a set S (usually Rn for us) together with a group G of transformations acting on S.

math.berkeley.edu/~ceur/notes_pdf/Eur_Math152_AffGeom.pdf

Math 152: Affine Geometry. Christopher Eur. October 21, 2014. This document summarizes results in Bennett's Affine and Projective Geometry by more or less.