Formats of files
used on WWW site of Yuri Matiyasevich

"plain" format, used mainly for data to be read by "every" computer algebra system
.dvi standard output of TeX systems, to be read on screen or printed by corresponding DVIdrivers
.gif standard picture format,
usually can be viewed directly by browser
.gif.gz standard picture format, compressed by UNIX utility gzip; most browsers can be instructed to uncompress the file and show the picture

native WWW file.
.nb MATHEMATICA notebook, can be viewed by free MATHEMATICA Player.
.ps PostScript file to be printed on printers understanding this language. With corresponding software can be viewed on screen and printed on non-PostScript printers
.ps.gz PostScript file, compressed by UNIX utility gzip.
.pdf file in Portable Document Format, can be viewed on screen with free Acrobat Reader.
.pdf.gz PDF file (see above), compressed by UNIX utility gzip.
.tex LaTex2e file (maybe also obsolete LaTex2.09)
.txt "plain" text file

URL of my Home page is