The Messenger of Mathematics, Vol. 10: May, 1880-April, 1881 (Classic Reprint) - Softcover

Whitworth, William Allen

 
9780282911546: The Messenger of Mathematics, Vol. 10: May, 1880-April, 1881 (Classic Reprint)

Synopsis

Excerpt from The Messenger of Mathematics, Vol. 10: May, 1880-April, 1881

Tp T9 where p and q are the points of contact of the fixed tangents (messenger IX. 66, Conversely, every line PQ Which satisfies the above relation is a tangent to the parabola, or the envelope of PQ is a parabola wbicb makes intercepts equal to Tp and Tq on tile fired lines.

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