http://mathforum.org/kb List of forum topics en http://mathforum.org/kb/thread.jspa?messageID=1692970&tstart=0#1692970 David Corfield <david.corfield@philosophy.oxford.ac.uk> wrote:

Jan 8, 2003 3:53:38 AM Jan 8, 2003 3:53:38 AM baez@galaxy.ucr.edu 0 http://mathforum.org/kb/thread.jspa?messageID=1692969&tstart=0#1692969 (1 - x^2) ^-1/2 = cosh(arctanh x)

To turn this into a species, note that cosh corresponds to]]> Jan 6, 2003 11:37:01 AM Jan 6, 2003 11:37:01 AM david.corfield@philosophy.oxford.ac.uk 0 http://mathforum.org/kb/thread.jspa?messageID=1692968&tstart=0#1692968 David Corfield <david.corfield@philosophy.oxford.ac.uk> wrote:

Jan 6, 2003 2:25:30 AM Jan 6, 2003 2:25:30 AM baez@galaxy.ucr.edu 1 http://mathforum.org/kb/thread.jspa?messageID=1692967&tstart=0#1692967 grateful for any comments.

The species of permutations on even sets]]> Jan 5, 2003 3:45:40 AM Jan 5, 2003 3:45:40 AM david.corfield@philosophy.oxford.ac.uk 3