We are pleased to be able to host the 9^th Polish-Czech Mathematical School. We will do our best to make your stay comfortable and productive. This is the nineth occasion where mathematicians and mathematics teachers from the Czech Republic, Slowakia, Ukraine and Poland will assembled to exchange new ideas and opinions in mathematics based on results obtained by research.
Dear friends: in the name of the Scientific and Organizing Committees and on my own behalf I express the hope that the very active program of the 9^th Polish-Czech Mathematical School will prove productive and enjoyable for all of us.

I wish you all a very pleasant stay.