Some fundamental relations in the projective differential geometry of ruled surfaces

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Carpenter, A. F. “Some Fundamental Relations in the Projective Differential Geometry of Ruled Surfaces”. Annali Di Matematica Pura Ed Applicata, vol. 26, no. 1, 1917, pp. 285-00, https://doi.org/10.1007/bf02679746.
Carpenter, A. F. (1917). Some fundamental relations in the projective differential geometry of ruled surfaces. Annali Di Matematica Pura Ed Applicata, 26(1), 285-300. https://doi.org/10.1007/bf02679746
Carpenter AF. Some fundamental relations in the projective differential geometry of ruled surfaces. Annali di Matematica Pura ed Applicata. 1917;26(1):285-300.
Refrences
Title Journal Journal Categories Citations Publication Date
ρ andσ are not in fact semi-covariants altho for convenience and followingWilczynski we shall speak of them as such. They are quantities which are cogredient withy andz. See W., p. 124.
Wilczynski,Projective Differential Geometry of Curves and Ruled Surfaces. Hereafter designated W.
W., pp. 165, 166.
W., pp. 149, 150.
W., p. 214.