The problems and solutions are provided in several file formats:
- PDF 1.4 is the primary format. Use this if the others are not displayed correctly. Among other programs, it can be viewed with Adobe Reader.
- HTML, with the formulae as images, is also provided for convenience.
- XHTML, with the formulae as MathML, is usually prettier than the plain HTML version, but it requires a browser with MathML support, such as Firefox with the proper fonts installed, or Internet Explorer with the MathPlayer plugin. The Opera browser's preliminary MathML support is not complete enough to view these pages.
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