Cover    Chapter I    Chapter II    Chapter III    Chapter IV     Maple Package

Introduction to Shalosh B. Ekhad's

"120 Pix-A-Pix Problems"

By Doron Zeilberger

Written: Feb. 17, 2009.

The Rules

You have to reconstruct a "picture" on the given grid, with the given information. The information lists the lenghts of consecutive runs of black squares in each row and column. Of course there must be at least one white space between any consecutive runs of black squares, but there does not have to be a white space at the very beginning or at the very end (but it may, of course).

To get an idea, simply look at the first problem and its solution.

The Maple package

In order to use the Maple package PICAPIX, just download it, and follow the on-line instructions. Have fun! Of course, you need to have the computer algebra system Maple on your computer.

Cover    Chapter I    Chapter II    Chapter III    Chapter IV    Maple Package