**Happy Ending problem**(so named by Paul ErdÅ‘s since it led to the marriage of George Szekeres and Esther Klein) is the following statement:

**Theorem**. Any set of five points in the plane in general position(no two points coincide and no

three points are collinear) has a subset of four points that form the vertices of a convex quadrilateral.

Quite misleading!

## 2 comments:

Hi. It's actually quite simple visually if you just construct a triangle with two points inside. You should read the article on www.mathworld.com, if you haven't already. It's easy to understand at least.

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