Because a player is three-dimensional, the area encompassing him by two yards on every side would have to be described as a cylinder surrounding his body with a radius of two yards from the level of the field to the top of his helmet.
To be precise, the cylinder would have the same contours as those of the player's body, so it would not be exactly circular. This cylinder would also be topped by a hemisphere with a radius of two yards.
Perhaps Dave Nelson of the NCAA rules committee should attend some of the classes that the athletes attend, to brush up on his geometry.
DANIEL B. HIRSCHHORN
Oak Park. Ill.
Enclosed is a photograph (above) of my 34th-birthday present. I thought I would share with you the tribute from my girl friend—she designed and knitted this "Dr. J sweater"—and me to Julius Erving, our alltime favorite basketball player. We took a little poetic license in adding to the design two other great players, Larry Bird and Magic Johnson. Unfortunately, we haven't seen enough of these players the past few years because we've been residing in the Netherlands.
JEFFREY P. STONE