Lecture presentations are available as PDF files, since it is quite
unlikely that any student in PHIL 262 will have any use for the
actual PowerPoint files.
PDF files can be printed and/or viewed offline using Acrobat Reader,
available at no cost from Adobe.
if you prefer to work with open license software, PDF files can
also be viewed and/or printed using
Ghostscript, with or without a graphical interface such as