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If the feet of lines from a point P, which lines are parallel with the sides of a triangle ABC, are collinear according to two different lines then P lies on an appropriate and unique circum ellipse and vice versa.
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Instead of proof: The statement apparently true if ABC triangle is equilateral and the appropriate ellipse is the circumcircle. Everyone can create a linear (affine) transformation which makes equilateral triangle from an arbitrary triangle and an inverse (affine) transformation from an equilateral triangle to an arbitrary triangle. So the circumcircle above become to the appropriate Steiner circumellipse by the invers transformation and parallel lines remain parallel. (See a geometric construction of Steiner circumellipse )


http://mzone.mweb.co.za/residents/profmd/miquel.pdf

http://frink.machighway.com/~dynamicm/miquel.html


Sandor Szanto from Hungary sandor.szanto@dkne.hu

See also:
Weisstein, Eric W. "Wilson's Theorem." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/WilsonsTheorem.html
My conjecture
Noise Optimized Signal Estimation