In the following, this work that I have authored consists of all material that I have authored that exists in the directory located at the web address http://www.greschak.com and in any subdirectories contained therein. It does not include the following:

• Images of the Platonic solids (i.e. tetra.gif, hexa.gif, octa.gif, dodeca.gif and icosa.gif) that were created by Tom Gettys using the program Persistence of Vision.
• Images of tranparent Platonic solids (i.e. ttetra.gif, thexa.gif, tocta.gif, tdodeca.gif and ticosa.gif) that were created by Jim Plank using the program Kaleido that was written by Dr. Zvi Har'El.
• Images of rotating dice (i.e. rdtetra.gif, rdhexa.gif, rdocta.gif, rddodeca.gif and rdicosa.gif) that were created by Bernhard Schaffer.
• The animated image of the Tower of Hanoi (i.e. twrhanoi.gif), which was copied from a page maintained by John Beidler.
• The portion of the file pdfmus/PDFUn.DLL in PDFMn.ZIP that consists of the compression library zlib that was created by Jean-loup Gailly and Mark Adler (where n in the ZIP and DLL file names is the version number of PDFmus).
• The content in the subdirectory http://www.greschak.com/bertha, all of which was created by my wife, Bertha.

John Greschak
July 4, 1999 (first notice)
January 15, 2008 (latest notice)