You have an ink stamp that is so amazingly precise that, when inked and pressed down on the plane, it makes every circle whose radius is an irrational number (centered at the center of the stamp) black.

Is it possible to use the stamp three times and make every point in the plane black?

If it is possible, where would you center the three stamps?

(In reply to re(4): alternation implies 1-1 by Cory Taylor)

ahhh, my bad.

Posted by SilverKnight on 2003-12-02 14:43:51