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Hello, this also is a place to introduce myself a little. 

Several email writers wanted to know whether I am a lazy student who doesn't finish his studying. This is a nice idea.

I was a teacher of mathematics and physics at a high school (German: Gymnasium) up to summer 2000. Now I am retired. Maybe people of my age solve crossword puzzles. I create web sites. I work on topics of the recreational mathematics with great pleasure. I had no time to do so as an active teacher. Sometimes I am astonished how many pages have already been assembled. 

Feedback: Email address on my main page

This page is also available in German.

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Jürgen Köller