Lectures On the Theory of Plane Curves Delivered to Post Graduate Students in
Lectures On the Theory of Plane Curves Delivered to Post Graduate Students in
Surendramohan Ganguli
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E. According as the conic is an hyper- bola, a parabola, or an ellipse. The curve again cuts the axis of x at the point . \—n, which is called the vertex. The only real asymptote to the curve is, *=//, and the curve has a real point of inflexion at infinity. 236. "^ The Logocyclic ciirrc /-v I lie ii/rer. '.^-f-) (1) 219 The nodal tangents are a;- — y'-^ =0, which are two right lines at right angles to each other. The only real asymptote is . V + a = Of which, therefore, makes an angle of ...45"^ with each nodal tangent. (Fig. 27. ) The polar equation of the curve is vcos^ = rteos2^. Let be the origin and J the vertex, and let the axis of, r, cut the asymptote at B. Transfering the origin to the vertex //, the polar ecpiatiou of the curve becomes r'^-\-)larsecO-\-a-^=zO (2) or r= —a(st'c6 + ia/i0) ... ... (3) or, changing the constant 237. We may use these properties of the logoeyclic cubic in showing that every nodal cubic can be [)rojeeted into a logoeyclic curve.
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