An Elementary Treatise On Trilinear Co-Ordinates: the Method of Reciprocal ...

Cover An Elementary Treatise On Trilinear Co-Ordinates: the Method of Reciprocal ...
An Elementary Treatise On Trilinear Co-Ordinates: the Method of Reciprocal ...
Norman Macleod Ferrers
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9. Since the tangents at the extremity of any diame- ter of a conic are parallel to one another, it follows that the polar of the centre is at an infinite distance, and con- versely, that the line at infinity reciprocates into the centre of the auxiliary conic. Hence it follows tliat parallel lines reciprocate into points lying on a straight line passing through the centre of the auxiliary conic ; and that the asymptotes of any curve, being the tangents drawn to it at the points where it meets
...the line at infinity, reciprocate into the points of contact of the tangents drawn to the reciprocal curve from the centre of the auxiliary conic.
Since the asymptotes of an hyperbola are real, while those of an ellipse are imaginary, it follows that the tangents, drawn from the centre of the auxiliary conic (supposed real) to the reciprocal curve, will be real or imaginary, according as the original curve is an hyperbola or an ellipse. If it be a para- bola, the reciprocal curve will pass through the centre of the conic, which is in accordance with what has already been 8tq,ted, that every parabola touches the line at infinity.


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