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• Some html (generally marked at the end of the page) is produced by a program called tth, which renders special symbols (greek letters, square root signs, etc.) using symbol fonts. Windows browsers (both Netscape and IE) generally have few problems. Macintosh Netscape and IE require selection of "MacRoman" font. Unix Netscape requires a small adaptation described at http://hutchinson.belmont.ma.us/tth/Xfonts.html. The "Tth" link at the bottom of such pages will take you to the tth manual, which explains all this in detail in the section "Browser Problems."

  Here is a test: Does your browser render these equations?
  C = 2pR , c = Ö (a² +b²), cosq = sin(p/2 - q)

• The pdf versions require Adobe's Acrobat Reader, which is freely available . Many computer installations will already have it, and it should open automatically when you click on a pdf.