The $2$-Hessian and sextactic points on plane algebraic curves
Keyword(s):
In an article from 1865, Arthur Cayley claims that given a plane algebraic curve there exists an associated $2$-Hessian curve that intersects it in its sextactic points. In this paper we fix an error in Cayley's calculations and provide the correct defining polynomial for the $2$-Hessian. In addition, we present a formula for the number of sextactic points on cuspidal curves and tie this formula to the $2$-Hessian. Lastly, we consider the special case of rational curves, where the sextactic points appear as zeros of the Wronski determinant of the 2nd Veronese embedding of the curve.
2016 ◽
Vol 26
(1)
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pp. 99-117
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2001 ◽
Vol 11
(04)
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pp. 439-453
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Keyword(s):
2007 ◽
Vol 2007
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pp. 1-11
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2009 ◽
Vol 2009
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pp. 1-12
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Keyword(s):