The Pentominoes
The figure below shows a solution (by Michael Keller) to an elegant problem proposed by
P.J. Torbijn and published as Problem 2032 in The Journal of Recreational Mathematics
(Volume 25, Number 1, 1993). Torbijn calls the problem 1 + 1 = 3: enclose
one set of pentominoes with two sets. The enclosed pentominoes are labeled with their
standard letter names; the two surrounding sets are shown in contrasting colors.
The drawing was made with a custom polyomino drawing program, and rendered using the
Dudeney polyform font available from Alpine Electronics.
This article is copyright ©1999 by Michael Keller. All rights reserved.