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Topic: PlanetMath
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Gerry Stahl

Posts: 29
Registered: 12/4/04
PlanetMath
Posted: May 29, 2004 10:14 PM
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I just came across a collaborative math encyclopedia at planetmath.org

It is an open source encyclopedia with entries contributed by the user
community -- rather like wikipedia, but specialized for math. It uses
Latex for math symbols. It is for college-level math (and beyond), so
would not be of much interest to powwowers.

But I did come across an interesting geopow:

Given 6 points along the circumference of a circle, ABCDEF, the points
at which AD & FC, DB & CE and AE & FB cross are colinear. Why is this
always true? For extra credit, prove the same result on a conic
section in 3D. (Pascal supposedly got the extra credit part, but, like
Fermat and many of us, the dog ate his proof before he could submit it
to the MathForum.)





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