Geodesic
A Theorem on Harmonic Homologies
Canadian mathematical bulletin, Tome 8 (1965) no. 3, pp. 375-377

Voir la notice de l'article provenant de la source Cambridge University Press

A collineation is a one-one mapping of a projective plane onto itself, taking points into points, lines into lines and preserving incidence, ([1], p. 247). A perspective collineation (sometimes called a central collineation) is a collineation which leaves invariant all points on a line h called the axis, and all lines through a point H called the centre. The perspective collineation is an elation if H is incident with h; otherwise it is a homology. 
Marsden, J. E. A Theorem on Harmonic Homologies. Canadian mathematical bulletin, Tome 8 (1965) no. 3, pp. 375-377. doi: 10.4153/CMB-1965-028-5
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[1] 1. Coxeter, H.S.M., Introduction to Geometry, John Wiley and Sons Inc. New York, 1961. Google Scholar

[2] 2. Coxeter, H.S.M., The Real Projective Plane (2nd ed), Cambridge University Press, London, 1955. Google Scholar

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