Odd Characters Found

The entry contains characters which are likely to cause problems with LaTeX typesetting. Please use the LaTeX syntax for accents (like \'e for e-acute or \"a for a-umlaut) and special characters of other languages. It is also possible that with a copy and paste command invisible characters were added to your entry (for example if you copy across several lines) and this will cause problems with LaTeX.

Please use the <Back> key of your browser to change your entry. If you think your entry is correct, but it does not pass this test, please contact mgander@math.mcgill.ca