[2] The polars of points Y on (c

[3] Previous properties justify the term: c

[4] Given X on c

Let the two conics (c) and (c

(z

which is the dual conic of the one defined through the inverse matrix of (A

C = AB

This shows [1] by determining the matrix C representing conic (c

The relation implies also that B = AC

To see last property interpret the polar p

z

PascalBrianchonDuality.html

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