properties of homology, which may be only theoretical, are of considerable importance in practice, being able to use all methods of representation and allowing you to perform all graphics operations in terms of design, without recourse to the spatial location of objects.
By varying the relative positions between the planes and centers of projection, there may be some special cases which do not alter the properties of projective.
can be distinguished:
- Homology or similarity homological affine : improper center, its axis.
- dilation : center right, improper axis.
- Congruence or translation: central misuse, improper axis.
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