Cover
Chapter I
Chapter II
Chapter III
Maple Package
Introduction to Shalosh B. Ekhad's
"90 Ring Ring Problems"
Written: July 5, 2021
The Rules
Fill the empty cells of the grid by drawing rectangles consisting of horizontal and vertical lines
passing through the cells' centers. The lines of the rectangles may cross but do not overlap. Corners of rectangles may not touch.
To get an idea, simply look at the
this problem and its
solution.
[Note: these puzzles appears currently (starting June 2021) in the New York Times Sunday magazine, and
are attributed there to Prasanna Seshadri.]
The Maple package
In order to use
the Maple package RingRing.txt,
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