Hi, PEN FRIENDS!
Here is the pdf file of PEN extended (version 0.9)! Lots of interesting problems from recent mathematics olympiads are available, YAY! Good problems from this book will be taken, and included to the original PEN Problems Book. If you find any typos or errors, then please email us at pen@problem-solving.be
PEN Problems Book has [...]
Archive for June 25th, 2008
PEN extended!
Posted in Notice on June 25, 2008 | Leave a Comment »
