Spazi planari metrici
We call planar space a triple (S,L,P), where (S,L) is a finite linear space non reduced to a line and P is a family of proper subspaces of (S,L), called planes, such that every plane contains three non-collinear points and through three non-collinear points there is a unique plane of P.
In (S,L,P) we define a metric which allows us to study the perspectivities between the triangles of (S,L,P).
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