Some information, if you really want to know.
Retired Mathematics Teacher and Computer Scientist.
Sailing in a Dutch Traditional 'Vollenhovense Bol 8.50 m'.
Unix/Linux. Open Source.
Programming in Python and Sage.
Sage is a free open-source mathematics software system.
Solving Mathematical Problems
OEIS, The On-Line Encyclopedia of Integer Sequences.
My visit to Saint Petersburg (Dutch) .
Sage Days 6 in Bristol. See my pictures.
Sailing at the 5ECM.
Sage Days 10 in Nancy. Some photos.
Spies Sage Development Prize
See my bookmarks (actually almost my bookmarks from my Mozilla browser at home).