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It is a straight line!
https://www.mathimatikoi.org/forum/viewtopic.php?f=22&t=670
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Author:  Tsakanikas Nickos [ Fri Jun 10, 2016 7:45 pm ]
Post subject:  It is a straight line!

Let $ c \ \colon \left[ 0,1 \right] \longrightarrow \mathbb{R}^{n} $ be a regular parametrized curve with the property that all its tangents pass through a fixed point. Show that the image of $c$ lies in a straight line. What can be said if the condition of regularity is dropped?

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