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(3): alteration by DJ)

Looking at the source for that disappearing not: it seems the site translated the closing greater than symbol of the i that opens the italics, into ampersand-gt; as if you had wanted a greater than sign to appear. Apparently these things happen sporadically, like the backslashes that sometimes get placed before quotes.
Edited on December 3, 2003, 9:00 am

Posted by Charlie on 2003-12-03 09:00:09