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Some Invariants and Covariants of Ternary Collineations
Excerpt from Some Invariants and Covariants of Ternary Collineations
With a 4-point we associate the 4-line obtained by taking the polar of each point with respect to the triangle of the other three. It is well known then that conversely the 4-point is obtained by taking the polar of each line with respect to the triangle of the other three. These mutually related systems have been called tetrad and counter-tetrad.
With a 4-point we associate the 4-line obtained by taking the polar of each point with respect to the triangle of the other three. It is well known then that conversely the 4-point is obtained by taking the polar of each line with respect to the triangle of the other three. These mutually related systems have been called tetrad and counter-tetrad.
38 pages, Paperback
First published July 27, 2015
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