Date: Mon, 13 Aug 2001
From: MARCOS MARINO <marcosm@physics.rutgers.edu>
Subject: misprint?

I think there is a misprint
in table 6.4 of your webbook on
group theory, in the quartic casimirs
of SU(N): the last entry is missing,
and the results are shifted, so most
of the results do not match with the
diagram... I actually checked it
with the table in the original book
published by Nordita, p. 154.

Date: Sat, 25 Jan 2003 
From: Marcos Marino <marcos@born.harvard.edu>
To: Predrag Cvitanovic <predrag.cvitanovic@physics.gatech.edu>
Subject: comments on Group Theory book


I have been reading some chapters on
the Group Theory book that I needed for
my research on Chern-Simons perturbation
theory, and I think I found couple of minor
misprints in section 9.11:

1) In eq. 9.101 there is a = missing. (PC: looks OK now)

2) I think that the "m" in 9.100 and 9.101
is actually a "p" multiplying the diagram
(cf. eq. 15.9). Am I right?		  (PC: you are right, fixed now)

The reason I read this section in detail
is because in what I'm doing the expansion of tr X^k
in terms of polinomials of tr x^m shows up, and in
principle for general representations.
Do you know of formulae like 9.103 -9.107 for
general reps?				(PC: No. You would have to use multinomials
					in X, Y, .... to go beyond fully symmetrized case)

Marcos Marino.