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Measurements and Transformations

In: Perspectives on Projective Geometry

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  • Jürgen Richter-Gebert

    (TU München, Zentrum Mathematik (M10) LS Geometrie)

Abstract

While in the last chapter we have focused on measurement aspects and related analytic issues, we will return to more qualitative relations of objects in a Cayley-Klein geometry. In this and the next chapter we will mainly study the projective nature of Cayley-Klein geometries. This chapter focuses on aspects concerning transformations, their (projective) invariants, and the behavior of measurements under these transformations. The next chapter treats geometric objects and their elementary geometric properties, including some elementary geometric theorems. Although Cayley-Klein geometries unify several rather different types of geometric playgrounds in a common projective framework, each type of geometry (in the sense of Section 20.6) has its very special properties. This is due to the fact that the degeneracies of the fundamental conic of the geometry lead to degeneracies in the relevant geometric constructions. For this reason we will sometimes have to perform a special case analysis for the different types of Cayley-Klein geometries. Sometimes one general definition covers a certain effect (for instance reflection) in all types of geometries. Still it may be instructive to consider its particular specialization to certain geometries.

Suggested Citation

  • Jürgen Richter-Gebert, 2011. "Measurements and Transformations," Springer Books, in: Perspectives on Projective Geometry, chapter 21, pages 399-422, Springer.
  • Handle: RePEc:spr:sprchp:978-3-642-17286-1_21
    DOI: 10.1007/978-3-642-17286-1_21
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